Tower Colosseum (Japanese: ラルガコロシアムRalga Colosseum) is a location in Orre. It is located at the top of Realgam Tower and is the site of Pokémon Colosseum's final battles. After Wes and Rui reach the top, Nascour makes Wes fight all four of the Trainers inside the Colosseum, all of whom have a Shadow Pokémon, being Miltank, Absol, Houndoom, and Tropius. He then challenges Wes himself, saying that he might be a valuable ally to their Shadow Pokémon, and allowing for a quick heal. Nascour will bring a Shadow Metagross along to attempt to defeat Wes. Once he is defeated, he appears to apologize to his secret leader, in which Wes and Rui question about. Evice, the secret leader of Cipher, appears and challenges Wes, after revealing his true identity and allowing another heal. He'll bring the ultimate Shadow Pokémon created along, a Shadow Tyranitar. Once defeated, Chief Sherles and Officer Johnson appear to arrest him. Duking, Silva, Eagun and his Pikachu arrive as well to say that Cipher is finished. Evice refuses and attempts to escape the newly arrived police via helicopter, but is thwarted by Ho-Oh's Sacred Fire.
The Tower Colosseum is a glorious stadium built in the center of mechanical towers. The Colosseum itself is a gigantic open dome with bleachers for spectators to watch. There is a giant Poké Ball shape circle in the center the battlefield. The Colosseum itself is surrounded by almost all sides by vast, complicated networks of large towers of varying sizes.