Very, very nice.
I loved the second part of this animation, very well done... but the first part, though it had some nice pieces to it, seemed... kinda... well, not very interesting. Not a lot of action really too place. Maybe I'm being to picky, not all openings need actiony scenes in them. With this one, I felt that it need more action to match the music.
But it was almost there!
Also... I think it's funny in a way. Pokemon has always been the least threatening series I know. Nobody dies :P, so a big Pokemon tearing down cities doesn't freak me out know everyone in those buildings are just going to "faint" xD