Room for improvement, but nontheless very good!
That's a nice, short animation you made there!
It's probably stated before in these reviews, but you need to improve on drawing bodies; most of the time, the bodies of Megaman and Zero weren't in proportion, which is a shame considering the rest of the animation is pretty superb: very well-used colours and shading, good pacing, nice animation and decently cut! And the sound was very nice as well!
As I said before, there's room for improvement, but a very decent flash nontheless.
I'm very impressed and I hope you'll keep getting better and better!
John