This depends if you are referring to Mega Charizard X or Mega Charizard Y. Mega Charizard X is black and blue with darker blue wings. Mega Charizard Y has similar coloring to regular Charizard and is orange and yellow with turquoise wings.
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It is black.
Charizard is not capable of naturally evolving further however as of Pokémon X and Pokémon Y, Charizard is capable of mega evolving into Charizard X or Charizard Y. Your trainer will need the Mega Ring in Pokémon X or Pokémon Y and then Charizard will need to be holding one of its respective Mega Stones in order to receive the option to mega evolve.
Charizard is the the final evolution of the line beginning with Charmander. It cannot evolve into another form (at least in the non-hacked games). It can, however, breed (at the Pokemon Daycare) and produce an egg which will give you access to an earlier evolution. Charizard can also Mega Evolve into two forms: Mega Charizard X or Y using Charizardite X or Y. Mega evolution, unlike regular evolution, is temporary, only happening during battle.
charizard is a fully evolved pokemon.
Charizard is a Fire and Flying type pokemon.