Unfortunately we don't allow fan clubs to be made on the generations themselves, since that's already covered by the other sections. You can however make a club specifically on the Pokemon of each generation, so a club solely discussing the Pokemon of generation V is perfectly fine, which I can see from the club that you submitted, might've been what you meant anyways. But that means you can discuss anything you want about those Pokemon, whether it'd be specific Pokemon belonging to specific trainers (like Marlon's Jellicent for example), but they need to be the fifth generation Pokemon exclusively.
You club has been approved, but I'd suggest adding a description telling what the club is about and reminding people not to talk about anything gen V related outside of the Pokemon. Of course discussion can branch into other stuff, but just try to steer it back on track :)