Go to the coffee house and by bean counters there is the bookroom. Go onto the book shelf and go into the book, the diary of captain rockhopper. Go all the way to the end (Which takes along time!) And there is the key.
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the answer is mogul
the riddle is mogul
Rockhopper.
In the coffee shop on the 2nd level in the brown book on the shelf you must read it till you find it
You're talking about pirate rockhopper. He comes every 2 months to club penguin. He sells merchandise but only stays for 10-15 minutes.