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Rosso (Japanese: ロッソRosso) is a Cipher Peon who appears in Pokémon Colosseum. He is first encountered at the Mayor's House in Phenac City along with Bluno, Verde, Miror B., Folly and Trudly. Leaving Wes to Folly and Trudly, Miror B. departs for Pyrite Town. Upon beating Folly and Trudly, Wes exits the Mayor's House to find the three Peons blocking the exits to the city. Rosso occupies the spot in front the city's eastern entrance. Wes must choose one of the three Peons to battle. The other two run away and disappear for quite some time. If Wes chooses to fight Rosso, he will be known as a Mystery Troop member during the first battle rather than a Cipher Peon. If Wes snags Rosso's Shadow Quilava, but loses all his Pokémon before the end of the battle, he may attempt to fight an alternate Peon, but they will not carry their Shadow Pokémon.
If Wes chooses to fight Rosso in Phenac City, he will appear for a rematch in Realgam Tower disguised as a receptionist behind the desk in the tower's casino. After he is beaten by Wes he vanishes and is not seen again.
Should Wes choose to fight Verde in Phenac City, Rosso will not show up until after beating the game in Snagem Hideout. If he chooses to fight Bluno, Rosso will not show up until after beating the game in the Shadow PKMN Lab.
He is dressed uniquely as compared to most other Cipher Peons. His outfit is red, rather than the usual light blue.