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.
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If you mean the Pokemon fan club in Vermillion City, then the answer is yes, it is free.
It is impossible to do that.
According to the privacy policy, you need to log into your account to unregister. You will be presented with instructions to follow. Contact the website's Privacy Policy Administrator to inquire if the data is deleted.
I believe you can change your "username," but not your screen name." It's unfortunate.
If you do not have access to the email address you sent it to you cannot activate your account. If you want to play, make a different account but make sure to use an email address that you do have access to so you can activate your account.