From the Super Mario Wiki
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Union is one of the four schools that competes in the Island Open in Mario Tennis and Mario Tennis: Power Tour, known for losing badly at tournaments. In the Game Boy Color game, no one from Union makes it past the first round in either tournament. In the Game Boy Advance game, Union bombs the doubles tournament, and only Chas makes it past the first round in the singles tournament--he loses to Mynx in the second round. In the Game Boy Advance game, Union was under the impression that they were the only school that taught Power Shots.
Game Boy Color Players from Union
Game Boy Advance Players from Union