Pokémon Colosseum is a role-playing video game in the Pokémon series developed by Genius Sonority and published by The Pokémon Company and Nintendo. It was released for the GameCube on November 21, 2003, in Japan; March 22, 2004, in North America; and May 14, 2004, in Europe. Unlike previous titles' random encounters with Pokémon, Colosseum allows the player to steal ("snag") the Pokémon of other Pokémon Trainers. The game also features single-player and multiplayer battle modes.

Pokémon is a series of video games developed by Game Freak and published by Nintendo and The Pokémon Company under the Pokémon media franchise. It was created by Satoshi Tajiri with assistance from Ken Sugimori, the first games, Pocket Monsters Red and Green, were released in 1996 in Japan for the Game Boy, later released outside of Japan as Pokémon Red Version and Blue Version. The main series of role-playing video games (RPGs), referred as the "core series" by their developers, has continued on each generation of Nintendo's handhelds. The most recently released core series games, Pokémon Scarlet and Violet, were released on November 18, 2022, for the Nintendo Switch.