Which Mega Charizard is dark?

Which Mega Charizard is dark? Charizard has two Mega Forms. Both feature a shorter snout, white, vertical slit pupils, and a bright underside reaching the lower jaw. As Mega Charizard X, its body and legs are more physically fit, though its arms remain thin. Its skin turns black with a sky-blue underside and soles.

Charizard has two Mega Forms. Both feature a shorter snout, white, vertical slit pupils, and a bright underside reaching the lower jaw. As Mega Charizard X, its body and legs are more physically fit, though its arms remain thin. Its skin turns black with a sky-blue underside and soles.