Their are two combo moves in KH2 performed by Sora, Goofy, and Donald. The combo performed by Sora and Donald is called Comet and can be upgraded to Comet Rain. The combo that Sora and Goofy can do together is called Gurnedo which can evolve to Gurnera and eventually Gurnega ("Gernade"). Apparently the combos seen can be evolved. Mabye Bushido can be evolved as well.