Dumbo is a CPU Mii and is bad in all sports.
Wii Sports[]
Dumbo's level in Tennis is -2.
His level in Baseball is 1 and has himself, Elisa, Emma, Luca, Akira, Matt, Kentaro, Abby, and Jessie.
His level in Boxing, though, is 57.
Wii Sports Resort[]
His level in Swordplay Duel and Speed Slice is 3.
His level in Basketball is -1 and his teammates are Miguel and Geoos.
His level in Table Tennis is 5.
He is bad in Cycling.