Me and a friend are making a clan for Pokemon Black and White, since there are going to be official rankings and a ladder, amongst other things such as the fact its now impossible to use hacked pokemon on wifi like in pokemon colleseum which really promotes competitive game play.
Random Matches:
In addition to that, once you have signed up on the Pokemon Global Link, you will have the ability to go in for Random Matches within the Pokemon Centers. Here, you can also get ranked based on your performance and your rankings will appear on the Pokemon Global Link website.
http://s4.zetaboards.com/pokemoninfo/
Right now we're just gathering information resources, since there isn't really one place with all the info one would need. Feel free to join even if you wanna just play casually.
We're looking for members who have a flash cart like an R4, but if your playing strictly on an emulator feel free to join. =0 R4s only cost like 20$ and you can transfer your .sav file to your R4 and continue playing on your DS. =P