Pokémon XD: Gale of Darkness

RPG where you play as Michael, a trainer working to stop the criminal organization Cipher from weaponizing shadow Pokémon—corrupted creatures with unstable, enhanced power. Your job: capture these shadow Pokémon before Cipher's operatives can deploy them, then purify and add them to your roster. Battles play out in 3D arenas against Cipher goons and their shadow teams. You can import Pokémon from Game Boy Advance cartridges to expand your collection, and the game supports head-to-head multiplayer battles. The story picks up after Colosseum's events, though prior knowledge isn't required. If you want traditional Pokémon mechanics in a console format with a darker premise than the mainline games, this delivers that specific angle.