From Bulbapedia, the community-driven Pokémon encyclopedia.
Colosseum Master Kruger (Japanese: コロシアムマスター ルトガー Colosseum Master Rutger) is the ninth Colosseum leader in Pokémon Battle Revolution, and the third and final Colosseum Master. He is the head of Courtyard Colosseum. His rose corsage, an item found on his suit, can be won in Neon Colosseum.
After the player beats Pokémon Battle Revolution, Courtyard Colosseum turns into a 100-Trainer challenge. Kruger is the 100th and final opponent; he also appears every ten battles other than his final appearance. Every time he appears the number of Pokémon each Trainer has increases by one, until each Trainer has four Pokémon.
Kruger seems to be the only Colosseum Master based on one of the Models the player can be (the Muscle Man's design, excluding clothes), complete with the Muscle Man's Sports Tape; despite having the Muscle Man's Face, he is a "Colosseum Master", rather than a Colosseum Leader. However, he is still based on a model exclusive to him, evidenced by different animations.
Courtyard Rank 1
Stargazer Colosseum - Master Match Set 3
Stargazer Colosseum - Master Match Set 7