Pocket Monsters Diamond Pearl: Regigigas Hokaku Daisakusen!!

Synopsis

Kaito finally reached the bottom floor of Snowpoint Temple. Upon readying himself to battle Regigigas, he notices that Regigigas is motionless, still sleeping. Wanting to catch this legendary Pokémon, he asks for his friends' help, reuniting the Regi trio to awaken the master of the trio. [Written by Phloup]