I am looking for a Mewtwonite Y, I am willing to trade any of the mega stones I have in return, including Mewtwonite X and Charizardite X.
Also, if there is another Pokémon X Version-exclusive Mega Stone which I don't have, which you may want, such as Pinsirite, I will be able to get that and trade it as well.
Please, if you wish to trade, give the item to an unwanted Pokémon and trade that; I do not wish to trade away the Mewtwo itself.
My friend code is 1719-4216-1138.