Pokémon Colosseum is exclusively available on the Nintendo GameCube. To play, you will need a functional GameCube console. Ensure your console is connected to a television using the appropriate AV cables (Composite, S-Video, or Component cables for higher quality). A stable power source for the console is also essential. The game does not require any online connectivity or specific internet setup, making it a self-contained experience.
For optimal gameplay and to save your progress, you will need a GameCube Memory Card. A standard 59-block memory card is sufficient for saving your game data. Insert the memory card into Slot A of your GameCube. If you intend to engage in trading or battling with other players, you will require a Game Boy Advance, a Game Boy Advance Link Cable, and a compatible Pokémon game on the Game Boy Advance (such as Pokémon Ruby, Sapphire, Emerald, FireRed, or LeafGreen). This setup allows for inter-generational Pokémon transfer and battles.