I believe you can change your "username," but not your screen name." It's unfortunate.
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If you mean the Pokemon fan club in Vermillion City, then the answer is yes, it is free.
yes why would you pay for something that doesnt help youy but either way yes its free
a club penguin trainer is a thing where you you can discover all the cheats in club penguin and make your penguin do that cheat.
There is no way to get into a member room unless you download a Club Penguin trainer. In some Club Penguin trainer's you can go into member rooms.
First of all this dosent have to do anthing with diamond and pearl and secondly heres how u do it. You have to have your parent creat an account so you can play.