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. He is the only character in the games to have the Trainer classMaster Senior (Japanese: マスターシニアMaster Senior).
After the player beats Pokémon Battle Revolution, Courtyard Colosseum turns into a 100-Trainer challenge called Survival Battle. 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. In these battles, his Trainer class becomes Survival King (Japanese: サバイバルキングSurvival King).
After defeating Kruger for the first time, he can be rebattled in the Courtyard Colosseum before beating the Stargazer Colosseum. The 6 Pokémon in his team are predominantly Dark and Ghost types. He always summons a Dark-type Pokémon first and always summons a Ghost-type Pokémon last.