I liked it, but it's much too short.
What you have there is like an intro. I liked it, but it needs a lot more. But other than the shortness, the music was good, the sprites were relatively well animated, and everything looked pretty cool.
The quality of the music was a bit odd (I could hear little crackling sounds in it), but nothing too bad. The pokéball sprite at the end had a bit of white around it, but that's not too important either.
Other than that, I don't have much else to complain about, especially considering it was so short. Just make something longer next time. :)