From Wikipedia: Disney's Kim Possible 3: Team Possible was released for the GBA on August 21, 2005 exclusively in North America. Kim and Ron have teamed up to form Team Possible to defeat Doctor Drakken, Shego, and other super villains. The game places the player in the role of Kim or Ron. Kim Possible 3 is the first game where Ron Stoppable is a playable character. Throughout the game, both characters must work together to advance through the game, as Kim may not be able to reach an area that Ron can. The game can be played with two players over a link cable connection; if this is not available, the player can toggle each character. The other character has no AI and will not move when the player is not controlling him or her.