That site rocks, but I need to add this info...
Another website with good strategies for each Pokémon is Serebii. Their 4th Gen Pokémon of the Week section has strategies on many Pokémon, as well as a better section on how to catch the Pokémon in the games, so you might want to check it out.
However, Smogon is better for some reasons.
First, the strategies on Serebii are just adaptations of the strategies on Smogon. Also, while Smogon updates its pages regularly with new strategies for each Pokémon, Serebii, as far as I know, NEVER updates a Pokémon's page. Also, Smogon has already got strategies for every Pokémon, while Serebii still has a few Pokémon to go.
These are a few reasons why I prefer Smogon over Serebii. However, I think you might want to check it out: