pokemon-showdown/mods/stadium/rulesets.js

exports.BattleFormats = {
	standard: {
		effectType: 'Banlist',
		ruleset: ['Sleep Clause Mod', 'Freeze Clause Mod', 'Species Clause', 'OHKO Clause', 'Evasion Moves Clause', 'Exact HP Mod', 'Cancel Mod'],
		banlist: ['Unreleased', 'Illegal'],
		validateSet: function (set) {
			// limit one of each move in Standard
			var moves = [];
			if (set.moves) {
				var hasMove = {};
				for (var i = 0; i < set.moves.length; i++) {
					var move = this.getMove(set.moves[i]);
					var moveid = move.id;
					if (hasMove[moveid]) continue;
					hasMove[moveid] = true;
					moves.push(set.moves[i]);
				}
			}
			set.moves = moves;
		}
	}
};