From the Super Mario Wiki
Whomp is a character in Mario Party Advance. According to his description, he is considered to be a "power" duelist, having strength that even surpasses Mouser's. He is one of the three duelists of Duel Tower, and is found on the first floor. After the player speaks briefly to Mouser, Whomp leaps down and gives the duelist greeting before briefly explaining that the player can advance to the next floor if they win. He then initiates the duel, which is Stair Scare. Once the player wins, Whomp admits that he didn't expect them to be so strong, but still lets them continue on before saying that he needs to continue training. The ending credits state that he's since become friends with Thwomp and somehow managed to move into his house.
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