[Ability] Implement Wimp Out and Emergency Exit (#4701)

* implement Wimp Out/Emergency Exit

* fixed test

* fixed weather bug

* Added nightmare interaction to Wimp Out following bug fix

* refactored and added postdamageattr

* bug fixes

* added confusion test back (skipped)

* updated applyPostDamageAbAttrs to applyPostDamage

* fix external func name

* fixed syntax inconsistency

* updated PostDamageForceSwitchAttr -> PostDamageForceSwitchAbAttr

* Modify `wimp_out.test.ts`

* remove extra comment

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* remove extra comment

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* Update tsdocs

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* remove comment

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* remove comment

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* fix tsdocs

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* fix tsdocs

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* fix tsdocs

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* fix tsdocs

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* fix whitespace

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* make getFailedText public

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* make switchOutLogic public

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* make getSwitchOutCondition public

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* make getFailedText public

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* make applyPostDamage public

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* simplify if statement

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* add public override to applyPostDamage

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* fixed nested if issue, remove trapped tag removal

* add fix for multi hit move

* added multi-lens logic

* moved applyPostDamageAbAttrs to pokemon.damage, added check for multi lens in pokemon.apply

* added source to damageAndUpdate and applyPostDamageAbAttrs, added Parental Bond logic + test, put applyPostDamageAbAttrs back in damageAndUpdate

* simplify multi hit check

Co-authored-by: innerthunder <168692175+innerthunder@users.noreply.github.com>

* Minor formatting changes

* Update src/data/ability.ts

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

* moved and renamed shouldPreventSwitchOut, rewrote tests to account for U-turn changes, fix syntax error

* Move comment slightly

---------

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>
Co-authored-by: innerthunder <168692175+innerthunder@users.noreply.github.com>

src/data/ability.ts

@@ -1,4 +1,4 @@
-import Pokemon, { HitResult, PlayerPokemon, PokemonMove } from "../field/pokemon";
+import Pokemon, { EnemyPokemon, HitResult, MoveResult, PlayerPokemon, PokemonMove } from "../field/pokemon";
 import { Type } from "./type";
 import { Constructor } from "#app/utils";
 import * as Utils from "../utils";
@@ -9,7 +9,7 @@ import { StatusEffect, getNonVolatileStatusEffects, getStatusEffectDescriptor, g
 import { Gender } from "./gender";
 import Move, { AttackMove, MoveCategory, MoveFlags, MoveTarget, FlinchAttr, OneHitKOAttr, HitHealAttr, allMoves, StatusMove, SelfStatusMove, VariablePowerAttr, applyMoveAttrs, IncrementMovePriorityAttr, VariableMoveTypeAttr, RandomMovesetMoveAttr, RandomMoveAttr, NaturePowerAttr, CopyMoveAttr, MoveAttr, MultiHitAttr, SacrificialAttr, SacrificialAttrOnHit, NeutralDamageAgainstFlyingTypeMultiplierAttr, FixedDamageAttr } from "./move";
 import { ArenaTagSide, ArenaTrapTag } from "./arena-tag";
-import { BerryModifier, PokemonHeldItemModifier } from "../modifier/modifier";
+import { BerryModifier, HitHealModifier, PokemonHeldItemModifier } from "../modifier/modifier";
 import { TerrainType } from "./terrain";
 import { SpeciesFormChangeManualTrigger, SpeciesFormChangeRevertWeatherFormTrigger, SpeciesFormChangeWeatherTrigger } from "./pokemon-forms";
 import i18next from "i18next";
@@ -17,7 +17,7 @@ import { Localizable } from "#app/interfaces/locales";
 import { Command } from "../ui/command-ui-handler";
 import { BerryModifierType } from "#app/modifier/modifier-type";
 import { getPokeballName } from "./pokeball";
-import { BattlerIndex } from "#app/battle";
+import { BattlerIndex, BattleType } from "#app/battle";
 import { Abilities } from "#enums/abilities";
 import { ArenaTagType } from "#enums/arena-tag-type";
 import { BattlerTagType } from "#enums/battler-tag-type";
@@ -29,6 +29,12 @@ import { PokemonHealPhase } from "#app/phases/pokemon-heal-phase";
 import { ShowAbilityPhase } from "#app/phases/show-ability-phase";
 import { StatStageChangePhase } from "#app/phases/stat-stage-change-phase";
 import BattleScene from "#app/battle-scene";
+import { SwitchType } from "#app/enums/switch-type";
+import { SwitchPhase } from "#app/phases/switch-phase";
+import { SwitchSummonPhase } from "#app/phases/switch-summon-phase";
+import { BattleEndPhase } from "#app/phases/battle-end-phase";
+import { NewBattlePhase } from "#app/phases/new-battle-phase";
+import { MoveEndPhase } from "#app/phases/move-end-phase";
 
 export class Ability implements Localizable {
   public id: Abilities;
@@ -3092,7 +3098,7 @@ export class SuppressWeatherEffectAbAttr extends PreWeatherEffectAbAttr {
 /**
  * Condition function to applied to abilities related to Sheer Force.
  * Checks if last move used against target was affected by a Sheer Force user and:
- * Disables: Color Change, Pickpocket, Wimp Out, Emergency Exit, Berserk, Anger Shell
+ * Disables: Color Change, Pickpocket, Berserk, Anger Shell
  * @returns {AbAttrCondition} If false disables the ability which the condition is applied to.
  */
 function getSheerForceHitDisableAbCondition(): AbAttrCondition {
@@ -4833,6 +4839,239 @@ async function applyAbAttrsInternal<TAttr extends AbAttr>(
   }
 }
 
+class ForceSwitchOutHelper {
+  constructor(private switchType: SwitchType) {}
+
+  /**
+   * Handles the logic for switching out a Pokémon based on battle conditions, HP, and the switch type.
+   *
+   * @param pokemon The {@linkcode Pokemon} attempting to switch out.
+   * @returns `true` if the switch is successful
+   */
+  public switchOutLogic(pokemon: Pokemon): boolean {
+    const switchOutTarget = pokemon;
+    /**
+     * If the switch-out target is a player-controlled Pokémon, the function checks:
+     * - Whether there are available party members to switch in.
+     * - If the Pokémon is still alive (hp > 0), and if so, it leaves the field and a new SwitchPhase is initiated.
+     */
+    if (switchOutTarget instanceof PlayerPokemon) {
+      if (switchOutTarget.scene.getParty().filter((p) => p.isAllowedInBattle() && !p.isOnField()).length < 1) {
+        return false;
+      }
+
+      if (switchOutTarget.hp > 0) {
+        switchOutTarget.leaveField(this.switchType === SwitchType.SWITCH);
+        pokemon.scene.prependToPhase(new SwitchPhase(pokemon.scene, this.switchType, switchOutTarget.getFieldIndex(), true, true), MoveEndPhase);
+        return true;
+      }
+    /**
+     * For non-wild battles, it checks if the opposing party has any available Pokémon to switch in.
+     * If yes, the Pokémon leaves the field and a new SwitchSummonPhase is initiated.
+     */
+    } else if (pokemon.scene.currentBattle.battleType !== BattleType.WILD) {
+      if (switchOutTarget.scene.getEnemyParty().filter((p) => p.isAllowedInBattle() && !p.isOnField()).length < 1) {
+        return false;
+      }
+      if (switchOutTarget.hp > 0) {
+        switchOutTarget.leaveField(this.switchType === SwitchType.SWITCH);
+        pokemon.scene.prependToPhase(new SwitchSummonPhase(pokemon.scene, this.switchType, switchOutTarget.getFieldIndex(),
+          (pokemon.scene.currentBattle.trainer ? pokemon.scene.currentBattle.trainer.getNextSummonIndex((switchOutTarget as EnemyPokemon).trainerSlot) : 0),
+          false, false), MoveEndPhase);
+        return true;
+      }
+    /**
+     * For wild Pokémon battles, the Pokémon will flee if the conditions are met (waveIndex and double battles).
+     */
+    } else {
+      if (!pokemon.scene.currentBattle.waveIndex && pokemon.scene.currentBattle.waveIndex % 10 === 0) {
+        return false;
+      }
+
+      if (switchOutTarget.hp > 0) {
+        switchOutTarget.leaveField(false);
+        pokemon.scene.queueMessage(i18next.t("moveTriggers:fled", { pokemonName: getPokemonNameWithAffix(switchOutTarget) }), null, true, 500);
+
+        if (switchOutTarget.scene.currentBattle.double) {
+          const allyPokemon = switchOutTarget.getAlly();
+          switchOutTarget.scene.redirectPokemonMoves(switchOutTarget, allyPokemon);
+        }
+      }
+
+      if (!switchOutTarget.getAlly()?.isActive(true)) {
+        pokemon.scene.clearEnemyHeldItemModifiers();
+
+        if (switchOutTarget.hp) {
+          pokemon.scene.pushPhase(new BattleEndPhase(pokemon.scene));
+          pokemon.scene.pushPhase(new NewBattlePhase(pokemon.scene));
+        }
+      }
+    }
+    return false;
+  }
+
+  /**
+   * Determines if a Pokémon can switch out based on its status, the opponent's status, and battle conditions.
+   *
+   * @param pokemon The Pokémon attempting to switch out.
+   * @param opponent The opponent Pokémon.
+   * @returns `true` if the switch-out condition is met
+   */
+  public getSwitchOutCondition(pokemon: Pokemon, opponent: Pokemon): boolean {
+    const switchOutTarget = pokemon;
+    const player = switchOutTarget instanceof PlayerPokemon;
+
+    if (player) {
+      const blockedByAbility = new Utils.BooleanHolder(false);
+      applyAbAttrs(ForceSwitchOutImmunityAbAttr, opponent, blockedByAbility);
+      return !blockedByAbility.value;
+    }
+
+    if (!player && pokemon.scene.currentBattle.battleType === BattleType.WILD) {
+      if (!pokemon.scene.currentBattle.waveIndex && pokemon.scene.currentBattle.waveIndex % 10 === 0) {
+        return false;
+      }
+    }
+
+    if (!player && pokemon.scene.currentBattle.isBattleMysteryEncounter() && !pokemon.scene.currentBattle.mysteryEncounter?.fleeAllowed) {
+      return false;
+    }
+
+    const party = player ? pokemon.scene.getParty() : pokemon.scene.getEnemyParty();
+    return (!player && pokemon.scene.currentBattle.battleType === BattleType.WILD)
+      || party.filter(p => p.isAllowedInBattle()
+        && (player || (p as EnemyPokemon).trainerSlot === (switchOutTarget as EnemyPokemon).trainerSlot)).length > pokemon.scene.currentBattle.getBattlerCount();
+  }
+
+  /**
+   * Returns a message if the switch-out attempt fails due to ability effects.
+   *
+   * @param target The target Pokémon.
+   * @returns The failure message, or `null` if no failure.
+   */
+  public getFailedText(target: Pokemon): string | null {
+    const blockedByAbility = new Utils.BooleanHolder(false);
+    applyAbAttrs(ForceSwitchOutImmunityAbAttr, target, blockedByAbility);
+    return blockedByAbility.value ? i18next.t("moveTriggers:cannotBeSwitchedOut", { pokemonName: getPokemonNameWithAffix(target) }) : null;
+  }
+}
+
+/**
+ * Calculates the amount of recovery from the Shell Bell item.
+ *
+ * If the Pokémon is holding a Shell Bell, this function computes the amount of health
+ * recovered based on the damage dealt in the current turn. The recovery is multiplied by the
+ * Shell Bell's modifier (if any).
+ *
+ * @param pokemon - The Pokémon whose Shell Bell recovery is being calculated.
+ * @returns The amount of health recovered by Shell Bell.
+ */
+function calculateShellBellRecovery(pokemon: Pokemon): number {
+  const shellBellModifier = pokemon.getHeldItems().find(m => m instanceof HitHealModifier);
+  if (shellBellModifier) {
+    return Utils.toDmgValue(pokemon.turnData.damageDealt / 8) * shellBellModifier.stackCount;
+  }
+  return 0;
+}
+
+/**
+ * Triggers after the Pokemon takes any damage
+ * @extends AbAttr
+ */
+export class PostDamageAbAttr extends AbAttr {
+  public applyPostDamage(pokemon: Pokemon, damage: number, passive: boolean, simulated: boolean, args: any[], source?: Pokemon): boolean | Promise<boolean> {
+    return false;
+  }
+}
+
+/**
+ * Ability attribute for forcing a Pokémon to switch out after its health drops below half.
+ * This attribute checks various conditions related to the damage received, the moves used by the Pokémon
+ * and its opponents, and determines whether a forced switch-out should occur.
+ *
+ * Used by Wimp Out and Emergency Exit
+ *
+ * @extends PostDamageAbAttr
+ * @see {@linkcode applyPostDamage}
+ */
+export class PostDamageForceSwitchAbAttr extends PostDamageAbAttr {
+  private helper: ForceSwitchOutHelper = new ForceSwitchOutHelper(SwitchType.SWITCH);
+  private hpRatio: number;
+
+  constructor(hpRatio: number = 0.5) {
+    super();
+    this.hpRatio = hpRatio;
+  }
+
+  /**
+   * Applies the switch-out logic after the Pokémon takes damage.
+   * Checks various conditions based on the moves used by the Pokémon, the opponents' moves, and
+   * the Pokémon's health after damage to determine whether the switch-out should occur.
+   *
+   * @param pokemon The Pokémon that took damage.
+   * @param damage The amount of damage taken by the Pokémon.
+   * @param passive N/A
+   * @param simulated Whether the ability is being simulated.
+   * @param args N/A
+   * @param source The Pokemon that dealt damage
+   * @returns `true` if the switch-out logic was successfully applied
+   */
+  public override applyPostDamage(pokemon: Pokemon, damage: number, passive: boolean, simulated: boolean, args: any[], source?: Pokemon): boolean | Promise<boolean> {
+    const moveHistory = pokemon.getMoveHistory();
+    // Will not activate when the Pokémon's HP is lowered by cutting its own HP
+    const fordbiddenAttackingMoves = [ Moves.BELLY_DRUM, Moves.SUBSTITUTE, Moves.CURSE, Moves.PAIN_SPLIT ];
+    if (moveHistory.length > 0) {
+      const lastMoveUsed = moveHistory[moveHistory.length - 1];
+      if (fordbiddenAttackingMoves.includes(lastMoveUsed.move)) {
+        return false;
+      }
+    }
+
+    // Dragon Tail and Circle Throw switch out Pokémon before the Ability activates.
+    const fordbiddenDefendingMoves = [ Moves.DRAGON_TAIL, Moves.CIRCLE_THROW ];
+    if (source) {
+      const enemyMoveHistory = source.getMoveHistory();
+      if (enemyMoveHistory.length > 0) {
+        const enemyLastMoveUsed = enemyMoveHistory[enemyMoveHistory.length - 1];
+        // Will not activate if the Pokémon's HP falls below half while it is in the air during Sky Drop.
+        if (fordbiddenDefendingMoves.includes(enemyLastMoveUsed.move) || enemyLastMoveUsed.move === Moves.SKY_DROP && enemyLastMoveUsed.result === MoveResult.OTHER) {
+          return false;
+        // Will not activate if the Pokémon's HP falls below half by a move affected by Sheer Force.
+        } else if (allMoves[enemyLastMoveUsed.move].chance >= 0 && source.hasAbility(Abilities.SHEER_FORCE)) {
+          return false;
+        // Activate only after the last hit of multistrike moves
+        } else if (source.turnData.hitsLeft > 1) {
+          return false;
+        }
+        if (source.turnData.hitCount > 1) {
+          damage = pokemon.turnData.damageTaken;
+        }
+      }
+    }
+
+    if (pokemon.hp + damage >= pokemon.getMaxHp() * this.hpRatio) {
+      // Activates if it falls below half and recovers back above half from a Shell Bell
+      const shellBellHeal = calculateShellBellRecovery(pokemon);
+      if (pokemon.hp - shellBellHeal < pokemon.getMaxHp() * this.hpRatio) {
+        for (const opponent of pokemon.getOpponents()) {
+          if (!this.helper.getSwitchOutCondition(pokemon, opponent)) {
+            return false;
+          }
+        }
+        return this.helper.switchOutLogic(pokemon);
+      } else {
+        return false;
+      }
+    } else {
+      return false;
+    }
+  }
+  public getFailedText(user: Pokemon, target: Pokemon, move: Move, cancelled: Utils.BooleanHolder): string | null {
+    return this.helper.getFailedText(target);
+  }
+}
+
+
 export function applyAbAttrs(attrType: Constructor<AbAttr>, pokemon: Pokemon, cancelled: Utils.BooleanHolder | null, simulated: boolean = false, ...args: any[]): Promise<void> {
   return applyAbAttrsInternal<AbAttr>(attrType, pokemon, (attr, passive) => attr.apply(pokemon, passive, simulated, cancelled, args), args, false, simulated);
 }
@@ -4866,6 +5105,11 @@ export function applyPostSetStatusAbAttrs(attrType: Constructor<PostSetStatusAbA
   return applyAbAttrsInternal<PostSetStatusAbAttr>(attrType, pokemon, (attr, passive) => attr.applyPostSetStatus(pokemon, sourcePokemon, passive, effect, simulated, args), args, false, simulated);
 }
 
+export function applyPostDamageAbAttrs(attrType: Constructor<PostDamageAbAttr>,
+  pokemon: Pokemon, damage: number, passive: boolean, simulated: boolean = false, args: any[], source?: Pokemon): Promise<void> {
+  return applyAbAttrsInternal<PostDamageAbAttr>(attrType, pokemon, (attr, passive) => attr.applyPostDamage(pokemon, damage, passive, simulated, args, source), args);
+}
+
 /**
  * Applies a field Stat multiplier attribute
  * @param attrType {@linkcode FieldMultiplyStatAbAttr} should always be FieldMultiplyBattleStatAbAttr for the time being
@@ -5607,11 +5851,11 @@ export function initAbilities() {
     new Ability(Abilities.STAMINA, 7)
       .attr(PostDefendStatStageChangeAbAttr, (target, user, move) => move.category !== MoveCategory.STATUS, Stat.DEF, 1),
     new Ability(Abilities.WIMP_OUT, 7)
-      .condition(getSheerForceHitDisableAbCondition())
+      .attr(PostDamageForceSwitchAbAttr)
-      .unimplemented(),
+      .edgeCase(), // Should not trigger when hurting itself in confusion
     new Ability(Abilities.EMERGENCY_EXIT, 7)
-      .condition(getSheerForceHitDisableAbCondition())
+      .attr(PostDamageForceSwitchAbAttr)
-      .unimplemented(),
+      .edgeCase(), // Should not trigger when hurting itself in confusion
     new Ability(Abilities.WATER_COMPACTION, 7)
       .attr(PostDefendStatStageChangeAbAttr, (target, user, move) => user.getMoveType(move) === Type.WATER && move.category !== MoveCategory.STATUS, Stat.DEF, 2),
     new Ability(Abilities.MERCILESS, 7)

src/data/move.ts

@@ -8,7 +8,7 @@ import { Constructor, NumberHolder } from "#app/utils";
 import * as Utils from "../utils";
 import { WeatherType } from "./weather";
 import { ArenaTagSide, ArenaTrapTag, WeakenMoveTypeTag } from "./arena-tag";
-import { allAbilities, AllyMoveCategoryPowerBoostAbAttr, applyAbAttrs, applyPostAttackAbAttrs, applyPreAttackAbAttrs, applyPreDefendAbAttrs, BlockItemTheftAbAttr, BlockNonDirectDamageAbAttr, BlockOneHitKOAbAttr, BlockRecoilDamageAttr, ConfusionOnStatusEffectAbAttr, FieldMoveTypePowerBoostAbAttr, FieldPreventExplosiveMovesAbAttr, ForceSwitchOutImmunityAbAttr, HealFromBerryUseAbAttr, IgnoreContactAbAttr, IgnoreMoveEffectsAbAttr, IgnoreProtectOnContactAbAttr, InfiltratorAbAttr, MaxMultiHitAbAttr, MoveAbilityBypassAbAttr, MoveEffectChanceMultiplierAbAttr, MoveTypeChangeAbAttr, ReverseDrainAbAttr, UncopiableAbilityAbAttr, UnsuppressableAbilityAbAttr, UnswappableAbilityAbAttr, UserFieldMoveTypePowerBoostAbAttr, VariableMovePowerAbAttr, WonderSkinAbAttr } from "./ability";
+import { allAbilities, AllyMoveCategoryPowerBoostAbAttr, applyAbAttrs, applyPostAttackAbAttrs, applyPreAttackAbAttrs, applyPreDefendAbAttrs, BlockItemTheftAbAttr, BlockNonDirectDamageAbAttr, BlockOneHitKOAbAttr, BlockRecoilDamageAttr, ConfusionOnStatusEffectAbAttr, FieldMoveTypePowerBoostAbAttr, FieldPreventExplosiveMovesAbAttr, ForceSwitchOutImmunityAbAttr, HealFromBerryUseAbAttr, IgnoreContactAbAttr, IgnoreMoveEffectsAbAttr, IgnoreProtectOnContactAbAttr, InfiltratorAbAttr, MaxMultiHitAbAttr, MoveAbilityBypassAbAttr, MoveEffectChanceMultiplierAbAttr, MoveTypeChangeAbAttr, PostDamageForceSwitchAbAttr, ReverseDrainAbAttr, UncopiableAbilityAbAttr, UnsuppressableAbilityAbAttr, UnswappableAbilityAbAttr, UserFieldMoveTypePowerBoostAbAttr, VariableMovePowerAbAttr, WonderSkinAbAttr } from "./ability";
 import { AttackTypeBoosterModifier, BerryModifier, PokemonHeldItemModifier, PokemonMoveAccuracyBoosterModifier, PokemonMultiHitModifier, PreserveBerryModifier } from "../modifier/modifier";
 import { BattlerIndex, BattleType } from "../battle";
 import { TerrainType } from "./terrain";
@@ -5761,6 +5761,7 @@ export class RevivalBlessingAttr extends MoveEffectAttr {
   }
 }
 
+
 export class ForceSwitchOutAttr extends MoveEffectAttr {
   constructor(
     private selfSwitch: boolean = false,
@@ -5779,12 +5780,19 @@ export class ForceSwitchOutAttr extends MoveEffectAttr {
       return false;
     }
 
-    /**
-     * Move the switch out logic inside the conditional block
-     * This ensures that the switch out only happens when the conditions are met
-     */
     const switchOutTarget = this.selfSwitch ? user : target;
     if (switchOutTarget instanceof PlayerPokemon) {
+      /**
+      * Check if Wimp Out/Emergency Exit activates due to being hit by U-turn or Volt Switch
+      * If it did, the user of U-turn or Volt Switch will not be switched out.
+      */
+      if (target.getAbility().hasAttr(PostDamageForceSwitchAbAttr) &&
+          (move.id === Moves.U_TURN || move.id === Moves.VOLT_SWITCH || move.id === Moves.FLIP_TURN)
+      ) {
+        if (this.hpDroppedBelowHalf(target)) {
+          return false;
+        }
+      }
       // Switch out logic for the player's Pokemon
       if (switchOutTarget.scene.getParty().filter((p) => p.isAllowedInBattle() && !p.isOnField()).length < 1) {
         return false;
@@ -5810,6 +5818,17 @@ export class ForceSwitchOutAttr extends MoveEffectAttr {
           false, false), MoveEndPhase);
       }
     } else {
+      /**
+      * Check if Wimp Out/Emergency Exit activates due to being hit by U-turn or Volt Switch
+      * If it did, the user of U-turn or Volt Switch will not be switched out.
+      */
+      if (target.getAbility().hasAttr(PostDamageForceSwitchAbAttr) &&
+          (move.id === Moves.U_TURN || move.id === Moves.VOLT_SWITCH) || move.id === Moves.FLIP_TURN) {
+        if (this.hpDroppedBelowHalf(target)) {
+          return false;
+        }
+      }
+
       // Switch out logic for everything else (eg: WILD battles)
       if (user.scene.currentBattle.waveIndex % 10 === 0) {
         return false;
@@ -5902,6 +5921,21 @@ export class ForceSwitchOutAttr extends MoveEffectAttr {
     }
     return ret;
   }
+
+  /**
+  * Helper function to check if the Pokémon's health is below half after taking damage.
+  * Used for an edge case interaction with Wimp Out/Emergency Exit.
+  * If the Ability activates due to being hit by U-turn or Volt Switch, the user of that move will not be switched out.
+  */
+  hpDroppedBelowHalf(target: Pokemon): boolean {
+    const pokemonHealth = target.hp;
+    const maxPokemonHealth = target.getMaxHp();
+    const damageTaken = target.turnData.damageTaken;
+    const initialHealth = pokemonHealth + damageTaken;
+
+    // Check if the Pokémon's health has dropped below half after the damage
+    return initialHealth >= maxPokemonHealth / 2 && pokemonHealth < maxPokemonHealth / 2;
+  }
 }
 
 export class ChillyReceptionAttr extends ForceSwitchOutAttr {

src/field/pokemon.ts

@@ -12,7 +12,7 @@ import * as Utils from "#app/utils";
 import { Type, TypeDamageMultiplier, getTypeDamageMultiplier, getTypeRgb } from "#app/data/type";
 import { getLevelTotalExp } from "#app/data/exp";
 import { Stat, type PermanentStat, type BattleStat, type EffectiveStat, PERMANENT_STATS, BATTLE_STATS, EFFECTIVE_STATS } from "#enums/stat";
-import { DamageMoneyRewardModifier, EnemyDamageBoosterModifier, EnemyDamageReducerModifier, EnemyEndureChanceModifier, EnemyFusionChanceModifier, HiddenAbilityRateBoosterModifier, BaseStatModifier, PokemonFriendshipBoosterModifier, PokemonHeldItemModifier, PokemonNatureWeightModifier, ShinyRateBoosterModifier, SurviveDamageModifier, TempStatStageBoosterModifier, TempCritBoosterModifier, StatBoosterModifier, CritBoosterModifier, TerastallizeModifier, PokemonBaseStatFlatModifier, PokemonBaseStatTotalModifier, PokemonIncrementingStatModifier, EvoTrackerModifier } from "#app/modifier/modifier";
+import { DamageMoneyRewardModifier, EnemyDamageBoosterModifier, EnemyDamageReducerModifier, EnemyEndureChanceModifier, EnemyFusionChanceModifier, HiddenAbilityRateBoosterModifier, BaseStatModifier, PokemonFriendshipBoosterModifier, PokemonHeldItemModifier, PokemonNatureWeightModifier, ShinyRateBoosterModifier, SurviveDamageModifier, TempStatStageBoosterModifier, TempCritBoosterModifier, StatBoosterModifier, CritBoosterModifier, TerastallizeModifier, PokemonBaseStatFlatModifier, PokemonBaseStatTotalModifier, PokemonIncrementingStatModifier, EvoTrackerModifier, PokemonMultiHitModifier } from "#app/modifier/modifier";
 import { PokeballType } from "#app/data/pokeball";
 import { Gender } from "#app/data/gender";
 import { initMoveAnim, loadMoveAnimAssets } from "#app/data/battle-anims";
@@ -22,7 +22,7 @@ import { reverseCompatibleTms, tmSpecies, tmPoolTiers } from "#app/data/balance/
 import { BattlerTag, BattlerTagLapseType, EncoreTag, GroundedTag, HighestStatBoostTag, SubstituteTag, TypeImmuneTag, getBattlerTag, SemiInvulnerableTag, TypeBoostTag, MoveRestrictionBattlerTag, ExposedTag, DragonCheerTag, CritBoostTag, TrappedTag, TarShotTag, AutotomizedTag, PowerTrickTag } from "../data/battler-tags";
 import { WeatherType } from "#app/data/weather";
 import { ArenaTagSide, NoCritTag, WeakenMoveScreenTag } from "#app/data/arena-tag";
-import { Ability, AbAttr, StatMultiplierAbAttr, BlockCritAbAttr, BonusCritAbAttr, BypassBurnDamageReductionAbAttr, FieldPriorityMoveImmunityAbAttr, IgnoreOpponentStatStagesAbAttr, MoveImmunityAbAttr, PreDefendFullHpEndureAbAttr, ReceivedMoveDamageMultiplierAbAttr, StabBoostAbAttr, StatusEffectImmunityAbAttr, TypeImmunityAbAttr, WeightMultiplierAbAttr, allAbilities, applyAbAttrs, applyStatMultiplierAbAttrs, applyPreApplyBattlerTagAbAttrs, applyPreAttackAbAttrs, applyPreDefendAbAttrs, applyPreSetStatusAbAttrs, UnsuppressableAbilityAbAttr, SuppressFieldAbilitiesAbAttr, NoFusionAbilityAbAttr, MultCritAbAttr, IgnoreTypeImmunityAbAttr, DamageBoostAbAttr, IgnoreTypeStatusEffectImmunityAbAttr, ConditionalCritAbAttr, applyFieldStatMultiplierAbAttrs, FieldMultiplyStatAbAttr, AddSecondStrikeAbAttr, UserFieldStatusEffectImmunityAbAttr, UserFieldBattlerTagImmunityAbAttr, BattlerTagImmunityAbAttr, MoveTypeChangeAbAttr, FullHpResistTypeAbAttr, applyCheckTrappedAbAttrs, CheckTrappedAbAttr, PostSetStatusAbAttr, applyPostSetStatusAbAttrs, InfiltratorAbAttr, AlliedFieldDamageReductionAbAttr } from "#app/data/ability";
+import { Ability, AbAttr, StatMultiplierAbAttr, BlockCritAbAttr, BonusCritAbAttr, BypassBurnDamageReductionAbAttr, FieldPriorityMoveImmunityAbAttr, IgnoreOpponentStatStagesAbAttr, MoveImmunityAbAttr, PreDefendFullHpEndureAbAttr, ReceivedMoveDamageMultiplierAbAttr, StabBoostAbAttr, StatusEffectImmunityAbAttr, TypeImmunityAbAttr, WeightMultiplierAbAttr, allAbilities, applyAbAttrs, applyStatMultiplierAbAttrs, applyPreApplyBattlerTagAbAttrs, applyPreAttackAbAttrs, applyPreDefendAbAttrs, applyPreSetStatusAbAttrs, UnsuppressableAbilityAbAttr, SuppressFieldAbilitiesAbAttr, NoFusionAbilityAbAttr, MultCritAbAttr, IgnoreTypeImmunityAbAttr, DamageBoostAbAttr, IgnoreTypeStatusEffectImmunityAbAttr, ConditionalCritAbAttr, applyFieldStatMultiplierAbAttrs, FieldMultiplyStatAbAttr, AddSecondStrikeAbAttr, UserFieldStatusEffectImmunityAbAttr, UserFieldBattlerTagImmunityAbAttr, BattlerTagImmunityAbAttr, MoveTypeChangeAbAttr, FullHpResistTypeAbAttr, applyCheckTrappedAbAttrs, CheckTrappedAbAttr, PostSetStatusAbAttr, applyPostSetStatusAbAttrs, InfiltratorAbAttr, AlliedFieldDamageReductionAbAttr, PostDamageAbAttr, applyPostDamageAbAttrs, PostDamageForceSwitchAbAttr } from "#app/data/ability";
 import PokemonData from "#app/system/pokemon-data";
 import { BattlerIndex } from "#app/battle";
 import { Mode } from "#app/ui/ui";
@@ -2818,7 +2818,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
          * We explicitly require to ignore the faint phase here, as we want to show the messages
          * about the critical hit and the super effective/not very effective messages before the faint phase.
          */
-        const damage = this.damageAndUpdate(isBlockedBySubstitute ? 0 : dmg, result as DamageResult, isCritical, isOneHitKo, isOneHitKo, true);
+        const damage = this.damageAndUpdate(isBlockedBySubstitute ? 0 : dmg, result as DamageResult, isCritical, isOneHitKo, isOneHitKo, true, source);
 
         if (damage > 0) {
           if (source.isPlayer()) {
@@ -2831,6 +2831,15 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           source.turnData.currDamageDealt = damage;
           this.turnData.damageTaken += damage;
           this.battleData.hitCount++;
+
+          // Multi-Lens and Parental Bond check for Wimp Out/Emergency Exit
+          if (this.hasAbilityWithAttr(PostDamageForceSwitchAbAttr)) {
+            const multiHitModifier = source.getHeldItems().find(m => m instanceof PokemonMultiHitModifier);
+            if (multiHitModifier || source.hasAbilityWithAttr(AddSecondStrikeAbAttr)) {
+              applyPostDamageAbAttrs(PostDamageAbAttr, this, damage, this.hasPassive(), false, [], source);
+            }
+          }
+
           const attackResult = { move: move.id, result: result as DamageResult, damage: damage, critical: isCritical, sourceId: source.id, sourceBattlerIndex: source.getBattlerIndex() };
           this.turnData.attacksReceived.unshift(attackResult);
           if (source.isPlayer() && !this.isPlayer()) {
@@ -2918,7 +2927,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       this.destroySubstitute();
       this.resetSummonData();
     }
-
     return damage;
   }
 
@@ -2932,12 +2940,13 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
    * @param ignoreFaintPhase boolean to ignore adding a FaintPhase, passsed to damage()
    * @returns integer of damage done
    */
-  damageAndUpdate(damage: integer, result?: DamageResult, critical: boolean = false, ignoreSegments: boolean = false, preventEndure: boolean = false, ignoreFaintPhase: boolean = false): integer {
+  damageAndUpdate(damage: integer, result?: DamageResult, critical: boolean = false, ignoreSegments: boolean = false, preventEndure: boolean = false, ignoreFaintPhase: boolean = false, source?: Pokemon): integer {
     const damagePhase = new DamagePhase(this.scene, this.getBattlerIndex(), damage, result as DamageResult, critical);
     this.scene.unshiftPhase(damagePhase);
     damage = this.damage(damage, ignoreSegments, preventEndure, ignoreFaintPhase);
     // Damage amount may have changed, but needed to be queued before calling damage function
     damagePhase.updateAmount(damage);
+    applyPostDamageAbAttrs(PostDamageAbAttr, this, damage, this.hasPassive(), false, [], source);
     return damage;
   }
 

src/phases/post-turn-status-effect-phase.ts

@@ -1,6 +1,6 @@
 import BattleScene from "#app/battle-scene";
 import { BattlerIndex } from "#app/battle";
-import { applyAbAttrs, BlockNonDirectDamageAbAttr, BlockStatusDamageAbAttr, ReduceBurnDamageAbAttr } from "#app/data/ability";
+import { applyAbAttrs, applyPostDamageAbAttrs, BlockNonDirectDamageAbAttr, BlockStatusDamageAbAttr, PostDamageAbAttr, ReduceBurnDamageAbAttr } from "#app/data/ability";
 import { CommonBattleAnim, CommonAnim } from "#app/data/battle-anims";
 import { getStatusEffectActivationText } from "#app/data/status-effect";
 import { BattleSpec } from "#app/enums/battle-spec";
@@ -41,6 +41,7 @@ export class PostTurnStatusEffectPhase extends PokemonPhase {
           // Set preventEndure flag to avoid pokemon surviving thanks to focus band, sturdy, endure ...
           this.scene.damageNumberHandler.add(this.getPokemon(), pokemon.damage(damage.value, false, true));
           pokemon.updateInfo();
+          applyPostDamageAbAttrs(PostDamageAbAttr, pokemon, damage.value, pokemon.hasPassive(), false, []);
         }
         new CommonBattleAnim(CommonAnim.POISON + (pokemon.status.effect - 1), pokemon).play(this.scene, false, () => this.end());
       } else {

src/test/abilities/wimp_out.test.ts

@@ -0,0 +1,614 @@
+import { BattlerIndex } from "#app/battle";
+import { ArenaTagSide } from "#app/data/arena-tag";
+import { allMoves } from "#app/data/move";
+import GameManager from "#app/test/utils/gameManager";
+import { Abilities } from "#enums/abilities";
+import { ArenaTagType } from "#enums/arena-tag-type";
+import { BattlerTagType } from "#enums/battler-tag-type";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import { Stat } from "#enums/stat";
+import { StatusEffect } from "#enums/status-effect";
+import { WeatherType } from "#enums/weather-type";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+describe("Abilities - Wimp Out", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .battleType("single")
+      .ability(Abilities.WIMP_OUT)
+      .enemySpecies(Species.NINJASK)
+      .enemyPassiveAbility(Abilities.NO_GUARD)
+      .startingLevel(90)
+      .enemyLevel(70)
+      .moveset([ Moves.SPLASH, Moves.FALSE_SWIPE, Moves.ENDURE ])
+      .enemyMoveset(Moves.FALSE_SWIPE)
+      .disableCrits();
+  });
+
+  function confirmSwitch(): void {
+    const [ pokemon1, pokemon2 ] = game.scene.getParty();
+
+    expect(game.phaseInterceptor.log).toContain("SwitchSummonPhase");
+
+    expect(pokemon1.species.speciesId).not.toBe(Species.WIMPOD);
+
+    expect(pokemon2.species.speciesId).toBe(Species.WIMPOD);
+    expect(pokemon2.isFainted()).toBe(false);
+    expect(pokemon2.getHpRatio()).toBeLessThan(0.5);
+  }
+
+  function confirmNoSwitch(): void {
+    const [ pokemon1, pokemon2 ] = game.scene.getParty();
+
+    expect(game.phaseInterceptor.log).not.toContain("SwitchSummonPhase");
+
+    expect(pokemon2.species.speciesId).not.toBe(Species.WIMPOD);
+
+    expect(pokemon1.species.speciesId).toBe(Species.WIMPOD);
+    expect(pokemon1.isFainted()).toBe(false);
+    expect(pokemon1.getHpRatio()).toBeLessThan(0.5);
+  }
+
+  it("triggers regenerator passive single time when switching out with wimp out", async () => {
+    game.override
+      .passiveAbility(Abilities.REGENERATOR)
+      .startingLevel(5)
+      .enemyLevel(100);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    const wimpod = game.scene.getPlayerPokemon()!;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(wimpod.hp).toEqual(Math.floor(wimpod.getMaxHp() * 0.33 + 1));
+    confirmSwitch();
+  });
+
+  it("It makes wild pokemon flee if triggered", async () => {
+    game.override.enemyAbility(Abilities.WIMP_OUT);
+    await game.classicMode.startBattle([
+      Species.GOLISOPOD,
+      Species.TYRUNT
+    ]);
+
+    const enemyPokemon = game.scene.getEnemyPokemon()!;
+    enemyPokemon.hp *= 0.52;
+
+    game.move.select(Moves.FALSE_SWIPE);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    const isVisible = enemyPokemon.visible;
+    const hasFled = enemyPokemon.switchOutStatus;
+    expect(!isVisible && hasFled).toBe(true);
+  });
+
+  it("Does not trigger when HP already below half", async () => {
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    const wimpod = game.scene.getPlayerPokemon()!;
+    wimpod.hp = 5;
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(wimpod.hp).toEqual(1);
+    confirmNoSwitch();
+  });
+
+  it("Trapping moves do not prevent Wimp Out from activating.", async () => {
+    game.override
+      .enemyMoveset([ Moves.SPIRIT_SHACKLE ])
+      .startingLevel(53)
+      .enemyLevel(45);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.phaseInterceptor.log).toContain("SwitchSummonPhase");
+    expect(game.scene.getPlayerPokemon()!.getTag(BattlerTagType.TRAPPED)).toBeUndefined();
+    expect(game.scene.getParty()[1].getTag(BattlerTagType.TRAPPED)).toBeUndefined();
+    confirmSwitch();
+  });
+
+  it("If this Ability activates due to being hit by U-turn or Volt Switch, the user of that move will not be switched out.", async () => {
+    game.override
+      .startingLevel(95)
+      .enemyMoveset([ Moves.U_TURN ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemyPokemon = game.scene.getEnemyPokemon()!;
+    const hasFled = enemyPokemon.switchOutStatus;
+    expect(hasFled).toBe(false);
+    confirmSwitch();
+  });
+
+  it("If this Ability does not activate due to being hit by U-turn or Volt Switch, the user of that move will be switched out.", async () => {
+    game.override
+      .startingLevel(190)
+      .startingWave(8)
+      .enemyMoveset([ Moves.U_TURN ]);
+    await game.classicMode.startBattle([
+      Species.GOLISOPOD,
+      Species.TYRUNT
+    ]);
+    const RIVAL_NINJASK1 = game.scene.getEnemyPokemon()?.id;
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("BerryPhase", false);
+    expect(game.scene.getEnemyPokemon()?.id !== RIVAL_NINJASK1);
+  });
+
+  it("Dragon Tail and Circle Throw switch out Pokémon before the Ability activates.", async () => {
+    game.override
+      .startingLevel(69)
+      .enemyMoveset([ Moves.DRAGON_TAIL ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    const wimpod = game.scene.getPlayerPokemon()!;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("SwitchSummonPhase", false);
+
+    expect(wimpod.summonData.abilitiesApplied).not.toContain(Abilities.WIMP_OUT);
+
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.scene.getPlayerPokemon()!.species.speciesId).not.toBe(Species.WIMPOD);
+  });
+
+  it("triggers when recoil damage is taken", async () => {
+    game.override
+      .moveset([ Moves.HEAD_SMASH ])
+      .enemyMoveset([ Moves.SPLASH ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.move.select(Moves.HEAD_SMASH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    confirmSwitch();
+  });
+
+  it("It does not activate when the Pokémon cuts its own HP", async () => {
+    game.override
+      .moveset([ Moves.SUBSTITUTE ])
+      .enemyMoveset([ Moves.SPLASH ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    const wimpod = game.scene.getPlayerPokemon()!;
+    wimpod.hp *= 0.52;
+
+    game.move.select(Moves.SUBSTITUTE);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    confirmNoSwitch();
+  });
+
+  it("Does not trigger when neutralized", async () => {
+    game.override
+      .enemyAbility(Abilities.NEUTRALIZING_GAS)
+      .startingLevel(5);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    confirmNoSwitch();
+  });
+
+  it("If it falls below half and recovers back above half from a Shell Bell, Wimp Out will activate even after the Shell Bell recovery", async () => {
+    game.override
+      .moveset([ Moves.DOUBLE_EDGE ])
+      .enemyMoveset([ Moves.SPLASH ])
+      .startingHeldItems([
+        { name: "SHELL_BELL", count: 3 },
+        { name: "HEALING_CHARM", count: 5 },
+      ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.75;
+
+    game.move.select(Moves.DOUBLE_EDGE);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.scene.getParty()[1].getHpRatio()).toBeGreaterThan(0.5);
+    expect(game.phaseInterceptor.log).toContain("SwitchSummonPhase");
+    expect(game.scene.getPlayerPokemon()!.species.speciesId).toBe(Species.TYRUNT);
+  });
+
+  it("Wimp Out will activate due to weather damage", async () => {
+    game.override
+      .weather(WeatherType.HAIL)
+      .enemyMoveset([ Moves.SPLASH ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    confirmSwitch();
+  });
+
+  it("Does not trigger when enemy has sheer force", async () => {
+    game.override
+      .enemyAbility(Abilities.SHEER_FORCE)
+      .enemyMoveset(Moves.SLUDGE_BOMB)
+      .startingLevel(95);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    confirmNoSwitch();
+  });
+
+  it("Wimp Out will activate due to post turn status damage", async () => {
+    game.override
+      .statusEffect(StatusEffect.POISON)
+      .enemyMoveset([ Moves.SPLASH ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("Wimp Out will activate due to bad dreams", async () => {
+    game.override
+      .statusEffect(StatusEffect.SLEEP)
+      .enemyAbility(Abilities.BAD_DREAMS);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.52;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("Wimp Out will activate due to leech seed", async () => {
+    game.override
+      .enemyMoveset([ Moves.LEECH_SEED ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.52;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("Wimp Out will activate due to curse damage", async () => {
+    game.override
+      .enemySpecies(Species.DUSKNOIR)
+      .enemyMoveset([ Moves.CURSE ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.52;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("Wimp Out will activate due to salt cure damage", async () => {
+    game.override
+      .enemySpecies(Species.NACLI)
+      .enemyMoveset([ Moves.SALT_CURE ])
+      .enemyLevel(1);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.70;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("Wimp Out will activate due to damaging trap damage", async () => {
+    game.override
+      .enemySpecies(Species.MAGIKARP)
+      .enemyMoveset([ Moves.WHIRLPOOL ])
+      .enemyLevel(1);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.55;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("Magic Guard passive should not allow indirect damage to trigger Wimp Out", async () => {
+    game.scene.arena.addTag(ArenaTagType.STEALTH_ROCK, 1, Moves.STEALTH_ROCK, 0, ArenaTagSide.ENEMY);
+    game.scene.arena.addTag(ArenaTagType.SPIKES, 1, Moves.SPIKES, 0, ArenaTagSide.ENEMY);
+    game.override
+      .passiveAbility(Abilities.MAGIC_GUARD)
+      .enemyMoveset([ Moves.LEECH_SEED ])
+      .weather(WeatherType.HAIL)
+      .statusEffect(StatusEffect.POISON);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.scene.getParty()[0].getHpRatio()).toEqual(0.51);
+    expect(game.phaseInterceptor.log).not.toContain("SwitchSummonPhase");
+    expect(game.scene.getPlayerPokemon()!.species.speciesId).toBe(Species.WIMPOD);
+  });
+
+  it("Wimp Out activating should not cancel a double battle", async () => {
+    game.override
+      .battleType("double")
+      .enemyAbility(Abilities.WIMP_OUT)
+      .enemyMoveset([ Moves.SPLASH ])
+      .enemyLevel(1);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    const enemyLeadPokemon = game.scene.getEnemyParty()[0];
+    const enemySecPokemon = game.scene.getEnemyParty()[1];
+
+    game.move.select(Moves.FALSE_SWIPE, 0, BattlerIndex.ENEMY);
+    game.move.select(Moves.SPLASH, 1);
+
+    await game.phaseInterceptor.to("BerryPhase");
+
+    const isVisibleLead = enemyLeadPokemon.visible;
+    const hasFledLead = enemyLeadPokemon.switchOutStatus;
+    const isVisibleSec = enemySecPokemon.visible;
+    const hasFledSec = enemySecPokemon.switchOutStatus;
+    expect(!isVisibleLead && hasFledLead && isVisibleSec && !hasFledSec).toBe(true);
+    expect(enemyLeadPokemon.hp).toBeLessThan(enemyLeadPokemon.getMaxHp());
+    expect(enemySecPokemon.hp).toEqual(enemySecPokemon.getMaxHp());
+  });
+
+  it("Wimp Out will activate due to aftermath", async () => {
+    game.override
+      .moveset([ Moves.THUNDER_PUNCH ])
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.AFTERMATH)
+      .enemyMoveset([ Moves.SPLASH ])
+      .enemyLevel(1);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.THUNDER_PUNCH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    confirmSwitch();
+  });
+
+  it("Activates due to entry hazards", async () => {
+    game.scene.arena.addTag(ArenaTagType.STEALTH_ROCK, 1, Moves.STEALTH_ROCK, 0, ArenaTagSide.ENEMY);
+    game.scene.arena.addTag(ArenaTagType.SPIKES, 1, Moves.SPIKES, 0, ArenaTagSide.ENEMY);
+    game.override
+      .enemySpecies(Species.CENTISKORCH)
+      .enemyAbility(Abilities.WIMP_OUT)
+      .startingWave(4);
+    await game.classicMode.startBattle([
+      Species.TYRUNT
+    ]);
+
+    expect(game.phaseInterceptor.log).not.toContain("MovePhase");
+    expect(game.phaseInterceptor.log).toContain("BattleEndPhase");
+  });
+
+  it("Wimp Out will activate due to Nightmare", async () => {
+    game.override
+      .enemyMoveset([ Moves.NIGHTMARE ])
+      .statusEffect(StatusEffect.SLEEP);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    game.scene.getPlayerPokemon()!.hp *= 0.65;
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.toNextTurn();
+
+    confirmSwitch();
+  });
+
+  it("triggers status on the wimp out user before a new pokemon is switched in", async () => {
+    game.override
+      .enemyMoveset(Moves.SLUDGE_BOMB)
+      .startingLevel(80);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    vi.spyOn(allMoves[Moves.SLUDGE_BOMB], "chance", "get").mockReturnValue(100);
+
+    game.move.select(Moves.SPLASH);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    expect(game.scene.getParty()[1].status?.effect).toEqual(StatusEffect.POISON);
+    confirmSwitch();
+  });
+
+  it("triggers after last hit of multi hit move", async () => {
+    game.override
+      .enemyMoveset(Moves.BULLET_SEED)
+      .enemyAbility(Abilities.SKILL_LINK);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.ENDURE);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemyPokemon = game.scene.getEnemyPokemon()!;
+    expect(enemyPokemon.turnData.hitsLeft).toBe(0);
+    expect(enemyPokemon.turnData.hitCount).toBe(5);
+    confirmSwitch();
+  });
+
+  it("triggers after last hit of multi hit move (multi lens)", async () => {
+    game.override
+      .enemyMoveset(Moves.TACKLE)
+      .enemyHeldItems([{ name: "MULTI_LENS", count: 1 }]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.ENDURE);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemyPokemon = game.scene.getEnemyPokemon()!;
+    expect(enemyPokemon.turnData.hitsLeft).toBe(0);
+    expect(enemyPokemon.turnData.hitCount).toBe(2);
+    confirmSwitch();
+  });
+  it("triggers after last hit of Parental Bond", async () => {
+    game.override
+      .enemyMoveset(Moves.TACKLE)
+      .enemyAbility(Abilities.PARENTAL_BOND);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+
+    game.scene.getPlayerPokemon()!.hp *= 0.51;
+
+    game.move.select(Moves.ENDURE);
+    game.doSelectPartyPokemon(1);
+    await game.phaseInterceptor.to("TurnEndPhase");
+
+    const enemyPokemon = game.scene.getEnemyPokemon()!;
+    expect(enemyPokemon.turnData.hitsLeft).toBe(0);
+    expect(enemyPokemon.turnData.hitCount).toBe(2);
+    confirmSwitch();
+  });
+
+  // TODO: This interaction is not implemented yet
+  it.todo("Wimp Out will not activate if the Pokémon's HP falls below half due to hurting itself in confusion", async () => {
+    game.override
+      .moveset([ Moves.SWORDS_DANCE ])
+      .enemyMoveset([ Moves.SWAGGER ]);
+    await game.classicMode.startBattle([
+      Species.WIMPOD,
+      Species.TYRUNT
+    ]);
+    const playerPokemon = game.scene.getPlayerPokemon()!;
+    playerPokemon.hp *= 0.51;
+    playerPokemon.setStatStage(Stat.ATK, 6);
+    playerPokemon.addTag(BattlerTagType.CONFUSED);
+
+    // TODO: add helper function to force confusion self-hits
+
+    while (playerPokemon.getHpRatio() > 0.49) {
+      game.move.select(Moves.SWORDS_DANCE);
+      await game.phaseInterceptor.to("TurnEndPhase");
+    }
+
+    confirmNoSwitch();
+  });
+});