Coach (Mario Party Advance)
From the Super Mario Wiki
“Can you spare an ear for a sad man?”
Coach works at a swimming school. There will be a swim meet in the pool and his student Cheep Cheep isn't confident. Coach will ask the player to race with him and lose, but looking natural. With this, he'll feel more confident. Once the quest is completed, Coach will give the Player the Desktop Golf Gaddget.
The ending of the game states that he wrote a book detailing his confidence-building techniques.