From the Super Mario Wiki
Dolphin is a character in Mario Party Advance. When encountered at the Mario Vaudeville, he glumly asks if the player could listen to his story. If accepted, he explains that he's a (self-proclaimed) good comedian, but has had difficulty to get any gigs. Because people don't laugh at his jokes, he doesn't have any confidence, leading him to ask if they could listen to his routine. He asks them to laugh whenever he tells a joke, in the hopes of getting someone else to watch him. After going through his routine, they end up amassing a crowd around him. Dolphin proudly states that he's a comic genius, thanks to the player's help, and gives them the Snow Globe Gaddget. He was also one of the three suspects who was around the area when Shroomlock was dragged off Sushi Cliff. When interrogated, he claimed that he was not responsible for anything, "cross [his] fins".
The ending credits state that he has since become a massively popular TV star.
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