implement wish move

src/data/arena-tag.ts

@@ -4,7 +4,7 @@ import * as Utils from "../utils";
 import { MoveCategory, StatChangeAttr, allMoves } from "./move";
 import { getPokemonMessage } from "../messages";
 import Pokemon, { HitResult, PokemonMove } from "../field/pokemon";
-import { MoveEffectPhase, StatChangePhase } from "../phases";
+import {MoveEffectPhase, PokemonHealPhase, StatChangePhase} from "../phases";
 import { StatusEffect } from "./status-effect";
 import { BattlerIndex } from "../battle";
 import { Moves } from "./enums/moves";
@@ -146,6 +146,26 @@ class AuroraVeilTag extends WeakenMoveScreenTag {
   }
 }
 
+class WishTag extends ArenaTag {
+  private slot: BattlerIndex;
+  private userName: string;
+  private health: number;
+  constructor(turnCount: integer, sourceId: integer, side: ArenaTagSide) {
+    super(ArenaTagType.WISH, turnCount, Moves.WISH, sourceId, side);
+  }
+  onAdd(arena: Arena): void {
+    const mon = arena.scene.getPokemonById(this.sourceId);
+    this.slot = mon.getBattlerIndex();
+    this.userName = mon.name;
+    this.health = mon.getMaxHp() / 2;
+  }
+  onRemove(arena: Arena): void {
+    const target = arena.scene.getField()[this.slot];
+    arena.scene.unshiftPhase(new PokemonHealPhase(target.scene, target.getBattlerIndex(),
+        Math.max(Math.floor(this.health), 1), this.userName + '\'s wish\ncame true!', true, false));
+  }
+}
+
 export class WeakenMoveTypeTag extends ArenaTag {
   private weakenedType: Type;
 
@@ -472,6 +492,8 @@ export function getArenaTag(tagType: ArenaTagType, turnCount: integer, sourceMov
     case ArenaTagType.FUTURE_SIGHT:
     case ArenaTagType.DOOM_DESIRE:
       return new DelayedAttackTag(tagType, sourceMove, sourceId, targetIndex);
+    case ArenaTagType.WISH:
+      return new WishTag(turnCount, sourceId, side);
     case ArenaTagType.STEALTH_ROCK:
       return new StealthRockTag(sourceId, side);
     case ArenaTagType.STICKY_WEB:

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

@@ -14,5 +14,6 @@ export enum ArenaTagType {
   GRAVITY = "GRAVITY",
   REFLECT = "REFLECT",
   LIGHT_SCREEN = "LIGHT_SCREEN",
-  AURORA_VEIL = "AURORA_VEIL"
+  AURORA_VEIL = "AURORA_VEIL",
+  WISH = "WISH"
 }

src/data/move.ts

@@ -4481,8 +4481,8 @@ export function initMoves() {
       .attr(AbilityCopyAttr),
     new SelfStatusMove(Moves.WISH, Type.NORMAL, -1, 10, -1, 0, 3)
       .triageMove()
-      .unimplemented(),
-    new SelfStatusMove(Moves.ASSIST, Type.NORMAL, -1, 20, -1, 0, 3)
+      .attr(AddArenaTagAttr, ArenaTagType.WISH, 2, true),
+  new SelfStatusMove(Moves.ASSIST, Type.NORMAL, -1, 20, -1, 0, 3)
       .attr(RandomMovesetMoveAttr, true)
       .ignoresVirtual(),
     new SelfStatusMove(Moves.INGRAIN, Type.GRASS, -1, 20, -1, 0, 3)