Pokersav for Black and White? Something tells me it wont let you play a card game in game. All stupid jokes aside.
It works, but it doesn't have the move data for new moves in it yet... so use with caution, I'm considering hacking my game to make it so my Pokemon will learn all the moves they had deleted at the next level up... I can't stand the 5 letter limit and the Japanese large font for English... I don't want to start a new game either. So long as your Pokemon knows no new moves it's fine to edit.
As soon as they add move support things should be fine. If worst comes to worst I suppose there's always the possibility of hex editing the save.