From what I know, you can't.
I do not know because I have completed it and he just stays there. (Looks like he is hiding something :l
It is hidden in a chest in chapter 5
we just can get it on April fool at the dock throw paint at the big paper when you have draw a treasure chest the purple hat will coming by the treasure chest
Flip in the room with red and blue things and you will see a pipe. Go in that pipe open the treasure chest open it to get it. But you will have to throw a block at a blue block to get out. Anymore questions about Super Paper Mario ask me :)
In "The Slave Dancer," Jessie goes to Captain Cawthorne's ship in Chapter 9 to retrieve a piece of paper from the treasure chest that has a message written on it by a captive boy. This message leads to a significant turning point in the story as Jessie becomes more involved in the plot to help the captives.
The 7th Chapter.
Chapter 4.
It's Chapter 1.
It's in Chapter 7.
The Crystal King
By getting dottie
chapter 4: shy guy toy box