He's right about Serebii being better than Wiki. In fact, Wikipedia'd probably be at the bottom between Serebii, Bulbapedia, and Google. Google because you can quickly find new stuff. Serebii because you get news and tons of info. Bulbapedia because it's dedicated to Pokemon info and can be updated instantly.
Agreed. If you Wikipedia Pokemon, your going to get info on Pokemon in general, not game info. Bulbapedia contains that kind of stuff, but Serebii is WAY more useful than Bulbapedia, but that doesn't make it a bad source. Google is OKAY, but chances are that it will lead you to Serebii or Bulbapedia.
I also know a few sites that contain useful things:
EDIT: How'd I get Spam Check??