diff --git a/src/data/ability.ts b/src/data/ability.ts
index cc9d10ed68b..e60394c9720 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -9,7 +9,7 @@ import { BattlerTag } from "./battler-tags";
 import { BattlerTagType } from "./enums/battler-tag-type";
 import { StatusEffect, getStatusEffectDescriptor, getStatusEffectHealText } from "./status-effect";
 import { Gender } from "./gender";
-import Move, { AttackMove, MoveCategory, MoveFlags, MoveTarget, RecoilAttr, StatusMoveTypeImmunityAttr, FlinchAttr, OneHitKOAttr, allMoves } from "./move";
+import Move, { AttackMove, MoveCategory, MoveFlags, MoveTarget, RecoilAttr, StatusMoveTypeImmunityAttr, FlinchAttr, OneHitKOAttr, HitHealAttr, StrengthSapHealAttr, allMoves } from "./move";
 import { ArenaTagSide } from "./arena-tag";
 import { ArenaTagType } from "./enums/arena-tag-type";
 import { Stat } from "./pokemon-stat";
@@ -521,6 +521,16 @@ export class MoveImmunityStatChangeAbAttr extends MoveImmunityAbAttr {
   }
 }
 
+export class ReverseDrainAbAttr extends PostDefendAbAttr {
+  applyPostDefend(pokemon: Pokemon, passive: boolean, attacker: Pokemon, move: PokemonMove, hitResult: HitResult, args: any[]): boolean {
+    if (!!move.getMove().getAttrs(HitHealAttr).length || !!move.getMove().getAttrs(StrengthSapHealAttr).length ) {
+      pokemon.scene.queueMessage(getPokemonMessage(attacker, ` sucked up the liquid ooze!`));
+      return true;
+    }
+    return false;
+  }
+}
+
 export class PostDefendStatChangeAbAttr extends PostDefendAbAttr {
   private condition: PokemonDefendCondition;
   private stat: BattleStat;
@@ -2549,7 +2559,8 @@ export function initAbilities() {
     new Ability(Abilities.MARVEL_SCALE, "Marvel Scale", "The Pokémon's marvelous scales boost the Defense stat if it has a status condition.", 3)
       .conditionalAttr(pokemon => !!pokemon.status, BattleStatMultiplierAbAttr, BattleStat.DEF, 1.5)
       .ignorable(),
-    new Ability(Abilities.LIQUID_OOZE, "Liquid Ooze (N)", "The oozed liquid has a strong stench, which damages attackers using any draining move.", 3),
+    new Ability(Abilities.LIQUID_OOZE, "Liquid Ooze", "The oozed liquid has a strong stench, which damages attackers using any draining move.", 3)
+      .attr(ReverseDrainAbAttr),
     new Ability(Abilities.OVERGROW, "Overgrow", "Powers up Grass-type moves when the Pokémon's HP is low.", 3)
       .attr(LowHpMoveTypePowerBoostAbAttr, Type.GRASS),
     new Ability(Abilities.BLAZE, "Blaze", "Powers up Fire-type moves when the Pokémon's HP is low.", 3)
diff --git a/src/data/battler-tags.ts b/src/data/battler-tags.ts
index c856fa05d3f..25ff41ec3e2 100644
--- a/src/data/battler-tags.ts
+++ b/src/data/battler-tags.ts
@@ -8,7 +8,7 @@ import * as Utils from "../utils";
 import { Moves } from "./enums/moves";
 import { ChargeAttr, MoveFlags, allMoves } from "./move";
 import { Type } from "./type";
-import { BlockNonDirectDamageAbAttr, FlinchEffectAbAttr, applyAbAttrs } from "./ability";
+import { BlockNonDirectDamageAbAttr, FlinchEffectAbAttr, ReverseDrainAbAttr, applyAbAttrs } from "./ability";
 import { Abilities } from "./enums/abilities";
 import { BattlerTagType } from "./enums/battler-tag-type";
 import { TerrainType } from "./terrain";
@@ -292,7 +292,11 @@ export class SeedTag extends BattlerTag {
           pokemon.scene.unshiftPhase(new CommonAnimPhase(pokemon.scene, source.getBattlerIndex(), pokemon.getBattlerIndex(), CommonAnim.LEECH_SEED));
 
           const damage = pokemon.damageAndUpdate(Math.max(Math.floor(pokemon.getMaxHp() / 8), 1));
-          pokemon.scene.unshiftPhase(new PokemonHealPhase(pokemon.scene, source.getBattlerIndex(), damage, getPokemonMessage(pokemon, '\'s health is\nsapped by Leech Seed!'), false, true));
+          const reverseDrain = pokemon.hasAbilityWithAttr(ReverseDrainAbAttr);
+          pokemon.scene.unshiftPhase(new PokemonHealPhase(pokemon.scene, source.getBattlerIndex(),
+            !reverseDrain ? damage : damage * -1,
+            !reverseDrain ? getPokemonMessage(pokemon, '\'s health is\nsapped by Leech Seed!') : getPokemonMessage(source, '\'s Leech Seed\nsucked up the liquid ooze!'),
+            false, true));
         }
       }
     }
diff --git a/src/data/move.ts b/src/data/move.ts
index df5a9fdbe85..08f03ac05f1 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -12,7 +12,7 @@ import * as Utils from "../utils";
 import { WeatherType } from "./weather";
 import { ArenaTagSide, ArenaTrapTag } from "./arena-tag";
 import { ArenaTagType } from "./enums/arena-tag-type";
-import { UnswappableAbilityAbAttr, UncopiableAbilityAbAttr, UnsuppressableAbilityAbAttr, NoTransformAbilityAbAttr, BlockRecoilDamageAttr, BlockOneHitKOAbAttr, IgnoreContactAbAttr, MaxMultiHitAbAttr, applyAbAttrs, BlockNonDirectDamageAbAttr, applyPreSwitchOutAbAttrs, PreSwitchOutAbAttr, applyPostDefendAbAttrs, PostDefendContactApplyStatusEffectAbAttr, MoveAbilityBypassAbAttr } from "./ability";
+import { UnswappableAbilityAbAttr, UncopiableAbilityAbAttr, UnsuppressableAbilityAbAttr, NoTransformAbilityAbAttr, BlockRecoilDamageAttr, BlockOneHitKOAbAttr, IgnoreContactAbAttr, MaxMultiHitAbAttr, applyAbAttrs, BlockNonDirectDamageAbAttr, applyPreSwitchOutAbAttrs, PreSwitchOutAbAttr, applyPostDefendAbAttrs, PostDefendContactApplyStatusEffectAbAttr, MoveAbilityBypassAbAttr, ReverseDrainAbAttr } from "./ability";
 import { Abilities } from "./enums/abilities";
 import { allAbilities } from './ability';
 import { PokemonHeldItemModifier } from "../modifier/modifier";
@@ -844,8 +844,12 @@ export class HitHealAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
+    const healAmount = Math.max(Math.floor(user.turnData.damageDealt * this.healRatio), 1);
+    const reverseDrain = pokemon.hasAbilityWithAttr(ReverseDrainAbAttr);
     user.scene.unshiftPhase(new PokemonHealPhase(user.scene, user.getBattlerIndex(),
-      Math.max(Math.floor(user.turnData.damageDealt * this.healRatio), 1), getPokemonMessage(target, ` had its\nenergy drained!`), false, true));
+      !reverseDrain ? healAmount : healAmount * -1,
+      !reverseDrain ? getPokemonMessage(target, ` had its\nenergy drained!`) : undefined,
+      false, true));
     return true;
   }
 
@@ -860,9 +864,12 @@ export class StrengthSapHealAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
+    const healAmount = target.stats[Stat.ATK] * (Math.max(2, 2 + target.summonData.battleStats[BattleStat.ATK]) / Math.max(2, 2 - target.summonData.battleStats[BattleStat.ATK]));
+    const reverseDrain = pokemon.hasAbilityWithAttr(ReverseDrainAbAttr);
     user.scene.unshiftPhase(new PokemonHealPhase(user.scene, user.getBattlerIndex(),
-      target.stats[Stat.ATK] * (Math.max(2, 2 + target.summonData.battleStats[BattleStat.ATK]) / Math.max(2, 2 - target.summonData.battleStats[BattleStat.ATK])),
-      getPokemonMessage(user, ` regained\nhealth!`), false, true));
+      !reverseDrain ? healAmount : healAmount * -1,
+      !reverseDrain ? getPokemonMessage(user, ` regained\nhealth!`) : undefined,
+      false, true));
     return true;
   }
 }
diff --git a/src/phases.ts b/src/phases.ts
index 7a766211f3a..f041d2daae8 100644
--- a/src/phases.ts
+++ b/src/phases.ts
@@ -3796,11 +3796,15 @@ export class PokemonHealPhase extends CommonAnimPhase {
     const hasMessage = !!this.message;
     let lastStatusEffect = StatusEffect.NONE;
 
-    if (!fullHp) {
+    if (!fullHp || this.hpHealed < 0) {
       const hpRestoreMultiplier = new Utils.IntegerHolder(1);
       if (!this.revive)
         this.scene.applyModifiers(HealingBoosterModifier, this.player, hpRestoreMultiplier);
       const healAmount = new Utils.NumberHolder(Math.floor(this.hpHealed * hpRestoreMultiplier.value));
+      if (healAmount.value < 0) {
+        pokemon.damageAndUpdate(healAmount.value * -1, HitResult.HEAL);
+        healAmount.value = 0;
+      }
       // Prevent healing to full if specified (in case of healing tokens so Sturdy doesn't cause a softlock)
       if (this.preventFullHeal && pokemon.hp + healAmount.value >= pokemon.getMaxHp())
         healAmount.value = (pokemon.getMaxHp() - pokemon.hp) - 1;