A Tuber (Japanese: うきわボーイInner Tube Boy and うきわガールInner Tube Girl) is a type of Pokémon Trainer that first debuted in the Generation III games. They are young children in inner tubes that are learning to swim. They come in male and female versions. They appear to be younger versions of Swimmers. The prize money for defeating them is generally low.
In FireRed and LeafGreen, there are no male Tubers, and the male version of the Trainer class is not even programmed into the games, despite there being a Sis and Bro Trainer class (which is a female Swimmer paired with a male Tuber).