When I got my Charizard, Sycamore gave me the stone that mega-evolves it into the black Charizard with blue flames. I know there's two mega-evolutions for Charizard, so does anyone know how to get the second one?
You get Charizardite X in Pokémon X, and you get Charizardite Y in Pokémon Y. You can only get both by trading it from the other version.
You have to have the other game to obtain the other stone, or through trading.