Update battle.ts

Author: KrisXV

play.pokemonshowdown.com/src/battle.ts

@@ -2529,16 +2529,18 @@ export class Battle {
 			this.log(args, kwArgs);
 			break;
 		}
-		case '-endTerastallize': {
-			let poke = this.getPokemon(args[1])!;
-			poke.removeVolatile('terastallize' as ID);
-			poke.teraType = '';
-			poke.terastallized = '';
-			poke.details = poke.details.replace(/, tera:[a-z]+/i, '');
-			poke.searchid = poke.searchid.replace(/, tera:[a-z]+/i, '');
-			this.scene.animTransform(poke, true);
-			this.scene.resetStatbar(poke);
-			this.log(args, kwArgs);
+		case '-custom': {
+			let poke = this.getPokemon(args[2])!;
+			if (args[1] && args[1] === 'endterastallize') {
+				poke.removeVolatile('terastallize' as ID);
+				poke.teraType = '';
+				poke.terastallized = '';
+				poke.details = poke.details.replace(/, tera:[a-z]+/i, '');
+				poke.searchid = poke.searchid.replace(/, tera:[a-z]+/i, '');
+				this.scene.animTransform(poke);
+				this.scene.resetStatbar(poke);
+				this.log(args, kwArgs);
+			}
 			break;
 		}
 		case '-start': {