colorchange

"colorchange": {
    desc: "This Pokemon's secondary type changes according to it's most powerful attack.",
    shortDesc: "This Pokemon's secondary type changes according to it's most powerful attack.",
    onStart: function (pokemon) {
        var secelt = [0, 0];
        for (var i in pokemon.moves) {
            var bp = this.getMove(pokemon.moves[i]).basePower;
            if (bp > secelt[0]) secelt = [bp, i];
        }
        var type = this.getMove(pokemon.moves[secelt[1]]).type;
        var pTypes = pokemon.types;
        if (pTypes[0] !== type && (!pTypes[1] || pTypes[1] !== type)) {
            pTypes[1] = type;
            this.add('-start', pokemon, 'typechange', pTypes.join('/'));
            pokemon.typesData = [
                {type: pTypes[0], suppressed: false, isAdded: false},
                {type: pTypes[1], suppressed: false, isAdded: false}
            ];
        }
    },
    id: "colorchange",
    name: "Color Change",
    rating: 4,
    num: 16
},