Awesomeness
The health bars are actually representative of a pokemon's energy. Therefore, every time a pokemon attacks or is hit, it would be drained, is my suggestion to you.
However, for attacking, the energy bar would decrease only very slightly.
It would make it look a lot better if you used that.
I have lots of pokemon experience myself and that's the way it works (supposedly) for the show. :p even though I hardly watch the show anymore. (they made the show STUPID.) I still collect the games and movies.
Anyway, that aside, it's an excellent animation, and I hope you make MORE!!!