(Update with PR and Trailer) Charizard has a second Mega Evolution - Mega Charizard X - Pure Nintendo
Charizard’s second mega evolution was shown during the Japanese broadcast of Pokemon Origins. The first Mega Evolution, which was shown a few weeks ago, seems exclusive to Pokemon Y.
This second Mega Evolution seems exclusive to Pokemon X.
Update: Just posted the official press release and trailer.Click for full press release
The previously announced Mega Charizard is in fact Mega Charizard Y. Players will need to obtain Charizardite Y in Pokémon Y in order to Mega Evolve Charizard into Mega Charizard Y. Mega Charizard Y’s Sp. Attack increases significantly, and its Ability changes to Drought, increasing the power of Fire-type moves. Mega Charizard Y can learn the Fire-type move Blast Burn which becomes even more powerful with the effect of the Drought Ability.
Mega Charizard X is being introduced for the first time today. Players can obtain Charizardite X in Pokémon X and Mega Evolve Charizard into Mega Charizard X. Mega Charizard X’s Attack increases significantly and its Ability also changes to Tough Claws, which raises the power of moves that make direct contact. This Ability comes in handy when Mega Charizard X learns the Dragon-type move Dragon Tail which can force an opposing Pokémon to switch out during battle while also dealing damage.