pokemon-showdown/test/sim/misc/megaevolution.js

'use strict';

const assert = require('./../../assert');
const common = require('./../../common');

let battle;

describe('Mega Evolution', () => {
	afterEach(() => {
		battle.destroy();
	});

	it('should overwrite normally immutable abilities', () => {
		battle = common.createBattle();
		battle.setPlayer('p1', { team: [
			{ species: "Metagross", ability: 'comatose', item: 'metagrossite', moves: ['metalclaw'] },
		] });
		battle.setPlayer('p2', { team: [
			{ species: "Wishiwashi", ability: 'schooling', moves: ['uturn'] },
		] });
		const megaMon = battle.p1.active[0];
		battle.makeChoices('move metalclaw mega', 'move uturn');
		assert.equal(megaMon.ability, 'toughclaws');
	});

	it('[Hackmons] should be able to override different formes but not same forme', () => {
		battle = common.createBattle([[
			{ species: "Charizard-Mega-Y", item: 'charizarditex', moves: ['protect'] },
		], [
			{ species: "Kangaskhan-Mega", item: 'kangaskhanite', moves: ['protect'] },
		]]);
		assert.equal(battle.p1.active[0].species.name, 'Charizard-Mega-Y');
		assert.throws(() => {
			battle.makeChoices('move protect mega', 'move protect mega');
		});
		battle.makeChoices('move protect mega', 'move protect');
		assert.equal(battle.p1.active[0].species.name, 'Charizard-Mega-X');
	});

	it('should happen once', () => {
		battle = common.gen(7).createBattle([[
			{ species: "Rayquaza", moves: ['dragondance', 'dragonascent'] },
		], [
			{ species: "Steelix", moves: ['splash'] },
		]]);
		battle.makeChoices('move dragondance mega', 'move splash');
		assert.throws(() => {
			battle.makeChoices('move dragondance mega', 'move splash');
		});
	});

	it('should modify speed/priority in gen 7+', () => {
		battle = common.createBattle([[
			{ species: 'Metagross', ability: 'prankster', item: 'metagrossite', moves: ['taunt'] },
		], [
			{ species: 'Wishiwashi', ability: 'prankster', moves: ['glare'] },
		]]);

		battle.makeChoices('move taunt mega', 'auto');
		let megaMon = battle.p1.active[0];
		assert.equal(megaMon.status, 'par');

		battle = common.createBattle([[
			{ species: 'Garchomp', item: 'garchompite', moves: ['taunt'] },
		], [
			{ species: 'Jirachi', moves: ['glare'] },
		]]);

		battle.makeChoices('move taunt mega', 'auto');
		megaMon = battle.p1.active[0];
		assert.equal(megaMon.status, 'par');

		battle = common.createBattle([[
			{ species: 'Metagross', item: 'metagrossite', moves: ['taunt'] },
		], [
			{ species: 'Jirachi', moves: ['glare'] },
		]]);

		battle.makeChoices('move taunt mega', 'auto');
		megaMon = battle.p1.active[0];
		assert.equal(megaMon.status, '');

		battle = common.gen(6).createBattle([[
			{ species: 'Metagross', ability: 'prankster', item: 'metagrossite', moves: ['taunt'] },
		], [
			{ species: 'Wishiwashi', ability: 'prankster', moves: ['glare'] },
		]]);

		battle.makeChoices('move taunt mega', 'auto');
		megaMon = battle.p1.active[0];
		assert.equal(megaMon.status, '');

		battle = common.gen(6).createBattle([[
			{ species: 'Garchomp', item: 'garchompite', moves: ['taunt'] },
		], [
			{ species: 'Jirachi', moves: ['glare'] },
		]]);

		battle.makeChoices('move taunt mega', 'auto');
		megaMon = battle.p1.active[0];
		assert.equal(megaMon.status, '');
	});

	it('should not break priority', () => {
		battle = common.createBattle();
		battle.setPlayer('p1', { team: [
			{ species: "Metagross", ability: 'quickfeet', item: 'metagrossite', moves: ['protect'] },
		] });
		battle.setPlayer('p2', { team: [
			{ species: "Ninjask", ability: 'quickfeet', moves: ['thunderwave'] },
		] });
		const megaMon = battle.p1.active[0];
		battle.makeChoices('move protect mega', 'auto');
		assert.equal(megaMon.status, '');
	});

	describe("Mega Rayquaza", () => {
		const TEAMS = [[
			{ species: "Rayquaza", ability: 'airlock', moves: ['dragonascent'], evs: { hp: 1 } },
		], [
			{ species: "Rayquaza", ability: 'airlock', moves: ['protect'], evs: { hp: 1 } },
		]];

		function assertCanMega(formatid) {
			battle = common.createBattle({ formatid }, TEAMS);
			battle.makeChoices(); // team preview
			battle.makeChoices('move 1 mega', 'auto');
			assert.equal(battle.p1.active[0].species.name, "Rayquaza-Mega");
		}

		function assertLegalButCantMega(formatid) {
			assert.legalTeam(TEAMS[0], formatid);
			battle = common.createBattle({ formatid }, TEAMS);
			battle.makeChoices(); // team preview
			assert.throws(() => battle.choose('p1', 'move 1 mega'));
		}

		it('should be able to Mega Evolve if it knows Dragon Ascent', () => {
			assertCanMega('gen6anythinggoes');
			// battle continues
			assert.throws(() => battle.choose('p2', 'move 1 mega'));
		});

		it('should be allowed to Mega Evolve in new gen formats allowing "Past" elements', () => {
			assertCanMega('gen9nationaldexag');
			battle.destroy();
			assertCanMega('gen9natdexdraft');
			battle.destroy();
			assertCanMega('gen8anythinggoes@@@+past');
		});

		it('should not be allowed to Mega Evolve in formats that have the Mega Rayquaza Clause', () => {
			assertLegalButCantMega('gen6ubers');
			battle.destroy();
			assertLegalButCantMega('gen9nationaldexubers');
		});

		it('should implicitly add the Mega Rayquaza Clause when banned', () => {
			assertLegalButCantMega('gen9nationaldexag@@@-rayquaza-mega');
			battle.destroy();
			assertLegalButCantMega('gen9nationaldexag@@@-mega');
			battle.destroy();
			assertLegalButCantMega('gen9nationaldexag@@@-ndag');

			// don't add it where unnecessary
			const format = common.getFormat({ formatid: 'gen4anythinggoes' });
			assert.false(Dex.formats.getRuleTable(format).has('megarayquazaclause'));
		});
	});
});