The new Mega Evolution has been revealed as Mega Charizard X, and as the name suggests is exclusive to Pokémon X. To turn Charizard into this form then you need it to be holding the Charizardite X. One of the most exciting changes to Charizard with this evolution however is the fact the Pokémon becomes a Fire and Dragon type, while Mega Charizard Y kept the original Fire and Flying type of Charizard. Mega Charizard X also gains a new ability known as Tough Claws which raises the power of moves which make direct contact.
A trailer showing off Mega Charizard was also released, you can watch that below: