A grand prix is a series of events. This is a 16 person tournament held on the Nintendo Worlds forum, celebrating the release of black & white. There are 5 tournaments total, kanto was last month, johto is this month, then jan is hoenn, feb is sinnoh, then march/april is unova. Players can only use pokemon from that gen and must use 2 ous, 2 uus, and 2 nus. Any NW member can join join so you can still make the last 3 if you join the forum.