Mega REvolution

/* config/formats.js */

{
    name: "Mega REvolution",

    mod: 'megarevolution',
    ruleset: ['OU'],
    validateSet: function (set) {
        var template = this.getTemplate(set.species);
        var item = this.getItem(set.item);
        if (item.megaStone) {
            if (template.baseStats && template.baseStats.hp > 110) {
                return ["" + (set.species || set.name) + " can't hold a Mega Stone as it has more than 110 base HP."];
            }
            if (template.species === 'Smeargle') return ["Smeargle can't hold a Mega Stone."];
            var megaTemplate = this.getTemplate(item.megaStone);
            if (megaTemplate.baseSpecies !== template.species) {
                var megaAbility = toId(megaTemplate.abilities['0']);
                if (megaAbility in {'aerilate':1, 'pixilate':1, 'refrigerate':1}) return ["" + item.name + " can only be held by its rightful owner."];
            }
        }
    }
}

/* mods/megarevolution/scripts.js */

exports.BattleScripts = {
    init: function () {
        var onTakeMegaStone = function (item, source) {
            return false;
        };
        for (var id in this.data.Items) {
            if (!this.data.Items[id].megaStone) continue;
            this.modData('Items', id).onTakeItem = onTakeMegaStone;
        }
    },
    canMegaEvo: function (pokemon) {
        var altForme = pokemon.baseTemplate.otherFormes && this.getTemplate(pokemon.baseTemplate.otherFormes[0]);
        if (altForme && altForme.isMega && altForme.requiredMove && pokemon.set.moves.indexOf(toId(altForme.requiredMove)) > -1) return altForme.species;
        var item = pokemon.getItem();
        if (item.megaStone === pokemon.species) return false;
        return item.megaStone;
    }
};