General Pokemon Info

Bulbapedia is the Wikipedia of Pokemon. It contains tons of information on every Pokemon game in the series as well as every Pokemon in the National Dex including stats, moveset and locations in each game. This is one of the most useful sites out there for Pokemon trainers.

Serebii is another extremely useful site and contains pretty much everything that Bulbapedia does. The sites are laid out in a slightly different way so its down to the person preference of each Trainer on which you'd like to use.