What is Rockhopper's password in Club Penguin?

Judging from the number of questions WikiAnswers gets asking for Rockhopper's PassWord, it is something many people are interested in. Because of that, it needs to be answered.

Here's what we know about Captain Rockhopper. He's a Penguin that sails the seas and shows up on Club Penguin every other month. He's very elusive and hard to find, which might be the reason so many are asking for his passWord. The trouble with that is passWords are personal and meant to protect an account.

Hacking is the only way we know to get a passWord unless the owner of the account gives it to you, and hacking an account and/or passWord is illegal and serious legal consequences can result if you are caught.