Glacemons' PMO bugfix

data/mods/glacemons/items.ts

@@ -1118,11 +1118,15 @@ export const Items: { [k: string]: ModdedItemData; } = {
 	parallelmegaorb: { 
 		name: "Parallel Mega Orb",
 		onTakeItem: false,
+		onBeforeMega(pokemon) {
+			pokemon.addVolatile('gastroacid');
+		},
 		onAfterMega(pokemon) {
 			let newAbility = pokemon.set.ability
 			const oldAbility = pokemon.setAbility(newAbility, pokemon, newAbility, true);
+			pokemon.removeVolatile('gastroacid');
 		},
-		onStart(pokemon) {
+		onPreStart(pokemon) {
 			let newAbility = pokemon.set.ability
 			const oldAbility = pokemon.setAbility(newAbility, pokemon, newAbility, true);
 		},

sim/battle-actions.ts

@@ -1884,6 +1884,8 @@ export class BattleActions {
 		const speciesid = pokemon.canMegaEvo || pokemon.canUltraBurst;
 		if (!speciesid) return false;
 
+		this.battle.runEvent('BeforeMega', pokemon);
+
 		pokemon.formeChange(speciesid, pokemon.getItem(), true);
 
 		// Limit one mega evolution

sim/dex-conditions.ts

@@ -7,6 +7,7 @@ export interface EventMethods {
 	onAfterEachBoost?: (this: Battle, boost: SparseBoostsTable, target: Pokemon, source: Pokemon, effect: Effect) => void;
 	onAfterHit?: MoveEventMethods['onAfterHit'];
 	onAfterMega?: (this: Battle, pokemon: Pokemon) => void;
+	onBeforeMega?: (this: Battle, pokemon: Pokemon) => void;
 	onAfterSetStatus?: (this: Battle, status: Condition, target: Pokemon, source: Pokemon, effect: Effect) => void;
 	onAfterSubDamage?: MoveEventMethods['onAfterSubDamage'];
 	onAfterSwitchInSelf?: (this: Battle, pokemon: Pokemon) => void;