During today's special Pocket Monsters THE ORIGIN ( ポケットモンスター THE ORIGIN), a special announcement was shown and it revealed Mega Charizard X.

Mega Charizard X	Mega Charizard Y
Species: Flame Pokémon Type: Fire/Dragon Ability: Tough Claws Height: 5' 07" Weight: 243.6 lbs.	Species: Flame Pokémon Type: Fire/Flying Ability: Drought Height: 5' 07" Weight: 221.6 lbs.

Mega Charizard X Revealed in Pokémon X

Last month it was revealed that fan favourite Charizard can achieve Mega Evolution, an extremely powerful form that only certain Pokémon can access during battles in the Pokémon X and Pokémon Y video games, launching worldwide October 12 for the Nintendo 3DS. It is now known that Charizard can Mega Evolve into either Mega Charizard X or Mega Charizard Y, depending on which Mega Stone it holds—Charizardite X or Charizardite Y. When Charizard Mega Evolves into Mega Charizard X, its body turns black and its flames burn blue with increased heat. It also changes types when it Mega Evolves, changing from a Fire- and Flying-type Pokémon to a Fire- and Dragon-type Pokémon!

The previously revealed 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 Special Attack increases significantly, and its Ability changes to Drought, increasing the power of Fire-type moves. Mega Charizard Y can use 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 changes to Tough Claws, which raises the power of moves that make direct contact. This Ability comes in handy when Mega Charizard X uses the Dragon-type move Dragon Tail, which does damage and can force an opposing Pokémon to switch out during battle.

The Pokémon Company International is sharing a gameplay trailer featuring Mega Charizard X and Mega Charizard Y in action.

Mega Charizard X Trailer

Source: http://www.pokemonxy.com/en-us/pokemon/mega_pokemon/