My site for search is without a doub google.
And the other sites i visit a lot is:
Pokemon community: Mainly the trade section, even if i don't make a lot of them XD
Gamefaqs: For walkthroughs, and the forums too.
Facebook: Lol, just i few minutes to see the news XD
Pokemon GL: For the dream world
Youtube: For opening of old animes.
Serebii: To see level evolutions, moves, and other things
Taringa: To see mainly memes XD