implements grudge, alters faint to not clear summondata until post faint phase

src/data/battler-tags.ts

@@ -1,12 +1,12 @@
 import { CommonAnim, CommonBattleAnim } from "./battle-anims";
-import { CommonAnimPhase, MoveEffectPhase, MovePhase, PokemonHealPhase, ShowAbilityPhase, StatChangePhase } from "../phases";
+import { CommonAnimPhase, FaintPhase, MoveEffectPhase, MovePhase, PokemonHealPhase, ShowAbilityPhase, StatChangePhase } from "../phases";
 import { getPokemonMessage, getPokemonPrefix } from "../messages";
-import Pokemon, { MoveResult, HitResult } from "../field/pokemon";
+import Pokemon, { MoveResult, HitResult, PokemonMove } from "../field/pokemon";
 import { Stat, getStatName } from "./pokemon-stat";
 import { StatusEffect } from "./status-effect";
 import * as Utils from "../utils";
 import { Moves } from "./enums/moves";
-import { ChargeAttr, MoveFlags, allMoves } from "./move";
+import { ChargeAttr, MoveCategory, MoveFlags, allMoves } from "./move";
 import { Type } from "./type";
 import { BlockNonDirectDamageAbAttr, FlinchEffectAbAttr, ReverseDrainAbAttr, applyAbAttrs } from "./ability";
 import { Abilities } from "./enums/abilities";
@@ -1249,6 +1249,50 @@ export class CursedTag extends BattlerTag {
   }
 }
 
+export class GrudgeTag extends BattlerTag {
+  private sourceIndex: integer;
+
+  constructor(sourceId: integer) {
+    super(BattlerTagType.GRUDGE, BattlerTagLapseType.PRE_MOVE, 2, Moves.GRUDGE, sourceId);
+  }
+
+  /**
+  * When given a battler tag or json representing one, load the data for it.
+  * @param {BattlerTag | any} source A battler tag
+  */
+  loadTag(source: BattlerTag | any): void {
+    super.loadTag(source);
+    this.sourceIndex = source.sourceIndex;
+  }
+
+  onAdd(pokemon: Pokemon): void {
+    super.onAdd(pokemon);
+    
+    pokemon.scene.queueMessage(getPokemonMessage(pokemon, " wants its target to bear a grudge!"));
+    this.sourceIndex = pokemon.scene.getPokemonById(this.sourceId).getBattlerIndex();
+  }
+
+  onRemove(pokemon: Pokemon): void {
+    super.onRemove(pokemon);
+
+    const effectPhase = pokemon.scene.getCurrentPhase();
+    if (effectPhase instanceof FaintPhase && pokemon.turnData?.attacksReceived?.length) {
+      const attackMoveResult = pokemon.turnData.attacksReceived[0];
+      const defeatSource = pokemon.scene.getPokemonById(attackMoveResult.sourceId);
+      if (defeatSource?.isOnField()) {
+        const faintingMove = defeatSource.getMoveset().find((move: PokemonMove) => move.moveId === attackMoveResult.move)
+        faintingMove.usePp(faintingMove.getMovePp())
+        defeatSource.scene.queueMessage(getPokemonMessage(defeatSource, `'s ${faintingMove.getName()} lost all of its PP due to the grudge!`));
+      }
+    }
+  }
+
+  lapse(pokemon: Pokemon, lapseType: BattlerTagLapseType): boolean {
+    
+    return super.lapse(pokemon, lapseType);
+  }
+}
+
 export function getBattlerTag(tagType: BattlerTagType, turnCount: integer, sourceMove: Moves, sourceId: integer): BattlerTag {
   switch (tagType) {
     case BattlerTagType.RECHARGING:
@@ -1354,6 +1398,8 @@ export function getBattlerTag(tagType: BattlerTagType, turnCount: integer, sourc
       return new SaltCuredTag(sourceId);
     case BattlerTagType.CURSED:
       return new CursedTag(sourceId);
+    case BattlerTagType.GRUDGE:
+      return new GrudgeTag(sourceId);
     case BattlerTagType.CHARGED:
       return new TypeBoostTag(tagType, sourceMove, Type.ELECTRIC, 2, true);
     case BattlerTagType.MAGNET_RISEN:

src/data/enums/battler-tag-type.ts

@@ -53,6 +53,7 @@ export enum BattlerTagType {
   IGNORE_FLYING = "IGNORE_FLYING",
   SALT_CURED = "SALT_CURED",
   CURSED = "CURSED",
+  GRUDGE = "GRUDGE",
   CHARGED = "CHARGED",
   GROUNDED = "GROUNDED",
   MAGNET_RISEN = "MAGNET_RISEN"

src/data/move.ts

@@ -4838,7 +4838,7 @@ export function initMoves() {
       .attr(HealStatusEffectAttr, true, StatusEffect.PARALYSIS, StatusEffect.POISON, StatusEffect.TOXIC, StatusEffect.BURN)
       .condition((user, target, move) => user.status && (user.status.effect === StatusEffect.PARALYSIS || user.status.effect === StatusEffect.POISON || user.status.effect === StatusEffect.TOXIC || user.status.effect === StatusEffect.BURN)),
     new SelfStatusMove(Moves.GRUDGE, Type.GHOST, -1, 5, -1, 0, 3)
-      .unimplemented(),
+      .attr(AddBattlerTagAttr, BattlerTagType.GRUDGE, true, true, 1, 1),
     new SelfStatusMove(Moves.SNATCH, Type.DARK, -1, 10, -1, 4, 3)
       .unimplemented(),
     new AttackMove(Moves.SECRET_POWER, Type.NORMAL, MoveCategory.PHYSICAL, 70, 100, 20, 30, 0, 3)

src/field/pokemon.ts

@@ -1531,7 +1531,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     this.hp = this.hp - damage;
     if (this.isFainted()) {
       this.scene.unshiftPhase(new FaintPhase(this.scene, this.getBattlerIndex(), preventEndure));
-      this.resetSummonData();
     }
 
     return damage;

src/phases.ts

@@ -3195,6 +3195,7 @@ export class FaintPhase extends PokemonPhase {
     }
 
     pokemon.lapseTags(BattlerTagLapseType.FAINT);
+    pokemon.resetSummonData();
     this.scene.getField(true).filter(p => p !== pokemon).forEach(p => p.removeTagsBySourceId(pokemon.id));
 
     pokemon.faintCry(() => {