Mega Charizard X has two attacks: the standard attack button executes Dragon Rush, corkscrewing in the direction the Circle Pad or Control Stick is tilted, and the special attack launches Fire Blast at opponents, trapping them in a multi-hitting flame. Dragon Rush deals 24% while Fire Blast deals 16% damage, and both can KO at around 110%.
Unlike Super Dragon, Charizard is not invincible, and taking damage will cause it to transform back to normal sooner. However, it takes half of normal damage and has infinite super armor, making it impossible to flinch.
If it hasn't taken any damage, Mega Charizard X's transformation will last up to 12 seconds.