His house is on the left side of the trouble centre is his house but it is locked. so use yoshi to go across the stream and climb on top of a flat roof and use yoshi again to get on top of the trouble centre then go to bobbery's chimney and use you rolling thing to get inside the chimney and talk to bobbery. He will reject your offer. then go to the bar in the plaza and talk to the barkeeper and listen to his story and then at the end he will ask you somthing and press the first answer and he will give you a note. Take it to bobbery and just wait.

Go to the moat and use yoshi to climb over. Then get to the top of the crates and use
yoshi again. Finally role into a tube andin the small opening. After that talk to Podly
the bar owner.He'll give you a letter to take to Bobbery.Talk to Bobbery again and he'll
go with you.