From MFG:
There's a tiny gap between Charizard's left foot (viewer's right) and the shadow. I would suggest moving the shadow offset up, but I think Charizard might be too high up anyway, so perhaps move him down about two pixels...?
Its Hypers are a little bit too powerful, seeing as they're all level 1s. I'd say Earthquake is fine at 200, but seeing as you can combo Fire Blast into Flare Blitz, which deal 235 and 255 damage, respectively, that's 490 damage! Almost half the average character's Life stat! Either lower the damage of them or increase the damage and make them level 2s (or do one for one, and one for the other :P).
Flamethrower might be too powerful on the medium and heavy variants. 60 for light is fine, but 105 for medium and 143 for heavy seems too much.
What's the point in the medium and heavy variants of Flight? The damage is the same as the light variant, and all they do is go higher, which leaves Charizard open should it miss.
Tail whip rarely hits twice on smaller/thinner characters.
One of his win poses doesn't end -- it just keeps going indefinitely. It's at about 1:45: