From the Super Mario Wiki
The Goldbob Guide is an item found in Paper Mario: The Thousand-Year Door. To use Grande Boom in Fahr Outpost, Mario must have permission from Goldbob and General White. When Mario asks Goldbob for permission, Goldbob demands that all of his coins are given to him. If Mario confirms, he gives every coin he has (though Goldbob soon gives them back), and Goldbob gives the guide to Mario as a sign of approval. It apparently contains instructions for the Bob-omb cannon.
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