[Ability] (Partially) Implement synchronize ability with old psycho shift interaction (#2746)

* Initial changes for Synchronize ability

* Fix psycho shift interaction causing buggy behaviour

* Update to show ability even if opponent pokemon does not get statused

* Fix some spacing

* Update tests

* Formatting change

* Remove impossible `if` statement

* Add `simulated` support

* Apply suggestions from code review

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

* Don't need those comments

---------

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>
Co-authored-by: flx-sta <50131232+flx-sta@users.noreply.github.com>
Co-authored-by: innerthunder <168692175+innerthunder@users.noreply.github.com>

src/data/ability.ts

@@ -1798,6 +1798,61 @@ export class PostDefendStealHeldItemAbAttr extends PostDefendAbAttr {
   }
 }
 
+/**
+ * Base class for defining all {@linkcode Ability} Attributes after a status effect has been set.
+ * @see {@linkcode applyPostSetStatus()}.
+ */
+export class PostSetStatusAbAttr extends AbAttr {
+  /**
+   * Does nothing after a status condition is set.
+   * @param pokemon {@linkcode Pokemon} that status condition was set on.
+   * @param sourcePokemon {@linkcode Pokemon} that that set the status condition. Is `null` if status was not set by a Pokemon.
+   * @param passive Whether this ability is a passive.
+   * @param effect {@linkcode StatusEffect} that was set.
+   * @param args Set of unique arguments needed by this attribute.
+   * @returns `true` if application of the ability succeeds.
+   */
+  applyPostSetStatus(pokemon: Pokemon, sourcePokemon: Pokemon | null = null, passive: boolean, effect: StatusEffect, simulated: boolean, args: any[]) : boolean | Promise<boolean> {
+    return false;
+  }
+}
+
+/**
+ * If another Pokemon burns, paralyzes, poisons, or badly poisons this Pokemon,
+ * that Pokemon receives the same non-volatile status condition as part of this
+ * ability attribute. For Synchronize ability.
+ */
+export class SynchronizeStatusAbAttr extends PostSetStatusAbAttr {
+  /**
+   * If the `StatusEffect` that was set is Burn, Paralysis, Poison, or Toxic, and the status
+   * was set by a source Pokemon, set the source Pokemon's status to the same `StatusEffect`.
+   * @param pokemon {@linkcode Pokemon} that status condition was set on.
+   * @param sourcePokemon {@linkcode Pokemon} that that set the status condition. Is null if status was not set by a Pokemon.
+   * @param passive Whether this ability is a passive.
+   * @param effect {@linkcode StatusEffect} that was set.
+   * @param args Set of unique arguments needed by this attribute.
+   * @returns `true` if application of the ability succeeds.
+   */
+  override applyPostSetStatus(pokemon: Pokemon, sourcePokemon: Pokemon | null = null, passive: boolean, effect: StatusEffect, simulated: boolean, args: any[]): boolean {
+    /** Synchronizable statuses */
+    const syncStatuses = new Set<StatusEffect>([
+      StatusEffect.BURN,
+      StatusEffect.PARALYSIS,
+      StatusEffect.POISON,
+      StatusEffect.TOXIC
+    ]);
+
+    if (sourcePokemon && syncStatuses.has(effect)) {
+      if (!simulated) {
+        sourcePokemon.trySetStatus(effect, true, pokemon);
+      }
+      return true;
+    }
+
+    return false;
+  }
+}
+
 export class PostVictoryAbAttr extends AbAttr {
   applyPostVictory(pokemon: Pokemon, passive: boolean, simulated: boolean, args: any[]): boolean | Promise<boolean> {
     return false;
@@ -4677,6 +4732,10 @@ export function applyStatMultiplierAbAttrs(attrType: Constructor<StatMultiplierA
   pokemon: Pokemon, stat: BattleStat, statValue: Utils.NumberHolder, simulated: boolean = false, ...args: any[]): Promise<void> {
   return applyAbAttrsInternal<StatMultiplierAbAttr>(attrType, pokemon, (attr, passive) => attr.applyStatStage(pokemon, passive, simulated, stat, statValue, args), args);
 }
+export function applyPostSetStatusAbAttrs(attrType: Constructor<PostSetStatusAbAttr>,
+  pokemon: Pokemon, effect: StatusEffect, sourcePokemon?: Pokemon | null, simulated: boolean = false, ...args: any[]): Promise<void> {
+  return applyAbAttrsInternal<PostSetStatusAbAttr>(attrType, pokemon, (attr, passive) => attr.applyPostSetStatus(pokemon, sourcePokemon, passive, effect, simulated, args), args, false, simulated);
+}
 
 /**
  * Applies a field Stat multiplier attribute
@@ -4907,7 +4966,8 @@ export function initAbilities() {
       .attr(EffectSporeAbAttr),
     new Ability(Abilities.SYNCHRONIZE, 3)
       .attr(SyncEncounterNatureAbAttr)
-      .unimplemented(),
+      .attr(SynchronizeStatusAbAttr)
+      .partial(), // interaction with psycho shift needs work, keeping to old Gen interaction for now
     new Ability(Abilities.CLEAR_BODY, 3)
       .attr(ProtectStatAbAttr)
       .ignorable(),

src/data/move.ts

@@ -2091,21 +2091,20 @@ export class PsychoShiftEffectAttr extends MoveEffectAttr {
 
     if (target.status) {
       return false;
-    }
+    } else {
-    //@ts-ignore - how can target.status.effect be checked when we return `false` before when it's defined?
+      const canSetStatus = target.canSetStatus(statusToApply, true, false, user);
-    if (!target.status || (target.status.effect === statusToApply && move.chance < 0)) { // TODO: resolve ts-ignore
+
-      const statusAfflictResult = target.trySetStatus(statusToApply, true, user);
+      if (canSetStatus) {
-      if (statusAfflictResult) {
         if (user.status) {
           user.scene.queueMessage(getStatusEffectHealText(user.status.effect, getPokemonNameWithAffix(user)));
         }
         user.resetStatus();
         user.updateInfo();
+        target.trySetStatus(statusToApply, true, user);
       }
-      return statusAfflictResult;
-    }
 
-    return false;
+      return canSetStatus;
+    }
   }
 
   getTargetBenefitScore(user: Pokemon, target: Pokemon, move: Move): number {

src/field/pokemon.ts

@@ -20,7 +20,7 @@ import { reverseCompatibleTms, tmSpecies, tmPoolTiers } from "../data/tms";
 import { BattlerTag, BattlerTagLapseType, EncoreTag, GroundedTag, HighestStatBoostTag, SubstituteTag, TypeImmuneTag, getBattlerTag, SemiInvulnerableTag, TypeBoostTag, MoveRestrictionBattlerTag, ExposedTag, DragonCheerTag, CritBoostTag, TrappedTag, TarShotTag } from "../data/battler-tags";
 import { WeatherType } from "../data/weather";
 import { ArenaTagSide, NoCritTag, WeakenMoveScreenTag } from "../data/arena-tag";
-import { Ability, AbAttr, StatMultiplierAbAttr, BlockCritAbAttr, BonusCritAbAttr, BypassBurnDamageReductionAbAttr, FieldPriorityMoveImmunityAbAttr, IgnoreOpponentStatStagesAbAttr, MoveImmunityAbAttr, PreDefendFullHpEndureAbAttr, ReceivedMoveDamageMultiplierAbAttr, ReduceStatusEffectDurationAbAttr, 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 } from "../data/ability";
+import { Ability, AbAttr, StatMultiplierAbAttr, BlockCritAbAttr, BonusCritAbAttr, BypassBurnDamageReductionAbAttr, FieldPriorityMoveImmunityAbAttr, IgnoreOpponentStatStagesAbAttr, MoveImmunityAbAttr, PreDefendFullHpEndureAbAttr, ReceivedMoveDamageMultiplierAbAttr, ReduceStatusEffectDurationAbAttr, 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 } from "../data/ability";
 import PokemonData from "../system/pokemon-data";
 import { BattlerIndex } from "../battle";
 import { Mode } from "../ui/ui";
@@ -3365,7 +3365,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     }
 
     if (asPhase) {
-      this.scene.unshiftPhase(new ObtainStatusEffectPhase(this.scene, this.getBattlerIndex(), effect, cureTurn, sourceText!, sourcePokemon!)); // TODO: are these bangs correct?
+      this.scene.unshiftPhase(new ObtainStatusEffectPhase(this.scene, this.getBattlerIndex(), effect, cureTurn, sourceText, sourcePokemon));
       return true;
     }
 
@@ -3399,6 +3399,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
 
     if (effect !== StatusEffect.FAINT) {
       this.scene.triggerPokemonFormChange(this, SpeciesFormChangeStatusEffectTrigger, true);
+      applyPostSetStatusAbAttrs(PostSetStatusAbAttr, this, effect, sourcePokemon);
     }
 
     return true;

src/phases/obtain-status-effect-phase.ts

@@ -9,26 +9,26 @@ import { PokemonPhase } from "./pokemon-phase";
 import { PostTurnStatusEffectPhase } from "./post-turn-status-effect-phase";
 
 export class ObtainStatusEffectPhase extends PokemonPhase {
-  private statusEffect: StatusEffect | undefined;
+  private statusEffect?: StatusEffect | undefined;
-  private cureTurn: integer | null;
+  private cureTurn?: integer | null;
-  private sourceText: string | null;
+  private sourceText?: string | null;
-  private sourcePokemon: Pokemon | null;
+  private sourcePokemon?: Pokemon | null;
 
-  constructor(scene: BattleScene, battlerIndex: BattlerIndex, statusEffect?: StatusEffect, cureTurn?: integer | null, sourceText?: string, sourcePokemon?: Pokemon) {
+  constructor(scene: BattleScene, battlerIndex: BattlerIndex, statusEffect?: StatusEffect, cureTurn?: integer | null, sourceText?: string | null, sourcePokemon?: Pokemon | null) {
     super(scene, battlerIndex);
 
     this.statusEffect = statusEffect;
-    this.cureTurn = cureTurn!; // TODO: is this bang correct?
+    this.cureTurn = cureTurn;
-    this.sourceText = sourceText!; // TODO: is this bang correct?
+    this.sourceText = sourceText;
-    this.sourcePokemon = sourcePokemon!; // For tracking which Pokemon caused the status effect // TODO: is this bang correct?
+    this.sourcePokemon = sourcePokemon; // For tracking which Pokemon caused the status effect
   }
 
   start() {
     const pokemon = this.getPokemon();
-    if (!pokemon?.status) {
+    if (pokemon && !pokemon.status) {
-      if (pokemon?.trySetStatus(this.statusEffect, false, this.sourcePokemon)) {
+      if (pokemon.trySetStatus(this.statusEffect, false, this.sourcePokemon)) {
         if (this.cureTurn) {
-            pokemon.status!.cureTurn = this.cureTurn; // TODO: is this bang correct?
+          pokemon.status!.cureTurn = this.cureTurn; // TODO: is this bang correct?
         }
         pokemon.updateInfo(true);
         new CommonBattleAnim(CommonAnim.POISON + (this.statusEffect! - 1), pokemon).play(this.scene, false, () => {
@@ -40,8 +40,8 @@ export class ObtainStatusEffectPhase extends PokemonPhase {
         });
         return;
       }
-    } else if (pokemon.status.effect === this.statusEffect) {
+    } else if (pokemon.status?.effect === this.statusEffect) {
-      this.scene.queueMessage(getStatusEffectOverlapText(this.statusEffect, getPokemonNameWithAffix(pokemon)));
+      this.scene.queueMessage(getStatusEffectOverlapText(this.statusEffect ?? StatusEffect.NONE, getPokemonNameWithAffix(pokemon)));
     }
     this.end();
   }

src/test/abilities/synchronize.test.ts

@@ -0,0 +1,109 @@
+import { StatusEffect } from "#app/data/status-effect";
+import GameManager from "#app/test/utils/gameManager";
+import { Abilities } from "#enums/abilities";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+describe("Abilities - Synchronize", () => {
+  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")
+      .startingLevel(100)
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.SYNCHRONIZE)
+      .moveset([Moves.SPLASH, Moves.THUNDER_WAVE, Moves.SPORE, Moves.PSYCHO_SHIFT])
+      .ability(Abilities.NO_GUARD);
+  }, 20000);
+
+  it("does not trigger when no status is applied by opponent Pokemon", async () => {
+    await game.classicMode.startBattle([Species.FEEBAS]);
+
+    game.move.select(Moves.SPLASH);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getParty()[0].status).toBeUndefined();
+    expect(game.phaseInterceptor.log).not.toContain("ShowAbilityPhase");
+  }, 20000);
+
+  it("sets the status of the source pokemon to Paralysis when paralyzed by it", async () => {
+    await game.classicMode.startBattle([Species.FEEBAS]);
+
+    game.move.select(Moves.THUNDER_WAVE);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getParty()[0].status?.effect).toBe(StatusEffect.PARALYSIS);
+    expect(game.scene.getEnemyParty()[0].status?.effect).toBe(StatusEffect.PARALYSIS);
+    expect(game.phaseInterceptor.log).toContain("ShowAbilityPhase");
+  }, 20000);
+
+  it("does not trigger on Sleep", async () => {
+    await game.classicMode.startBattle();
+
+    game.move.select(Moves.SPORE);
+
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getParty()[0].status?.effect).toBeUndefined();
+    expect(game.scene.getEnemyParty()[0].status?.effect).toBe(StatusEffect.SLEEP);
+    expect(game.phaseInterceptor.log).not.toContain("ShowAbilityPhase");
+  }, 20000);
+
+  it("does not trigger when Pokemon is statused by Toxic Spikes", async () => {
+    game.override
+      .ability(Abilities.SYNCHRONIZE)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(Array(4).fill(Moves.TOXIC_SPIKES));
+
+    await game.classicMode.startBattle([Species.FEEBAS, Species.MILOTIC]);
+
+    game.move.select(Moves.SPLASH);
+    await game.toNextTurn();
+
+    game.doSwitchPokemon(1);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getParty()[0].status?.effect).toBe(StatusEffect.POISON);
+    expect(game.scene.getEnemyParty()[0].status?.effect).toBeUndefined();
+    expect(game.phaseInterceptor.log).not.toContain("ShowAbilityPhase");
+  }, 20000);
+
+  it("shows ability even if it fails to set the status of the opponent Pokemon", async () => {
+    await game.classicMode.startBattle([Species.PIKACHU]);
+
+    game.move.select(Moves.THUNDER_WAVE);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getParty()[0].status?.effect).toBeUndefined();
+    expect(game.scene.getEnemyParty()[0].status?.effect).toBe(StatusEffect.PARALYSIS);
+    expect(game.phaseInterceptor.log).toContain("ShowAbilityPhase");
+  }, 20000);
+
+  it("should activate with Psycho Shift after the move clears the status", async () => {
+    game.override.statusEffect(StatusEffect.PARALYSIS);
+    await game.classicMode.startBattle();
+
+    game.move.select(Moves.PSYCHO_SHIFT);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getParty()[0].status?.effect).toBe(StatusEffect.PARALYSIS); // keeping old gen < V impl for now since it's buggy otherwise
+    expect(game.scene.getEnemyParty()[0].status?.effect).toBe(StatusEffect.PARALYSIS);
+    expect(game.phaseInterceptor.log).toContain("ShowAbilityPhase");
+  }, 20000);
+});