Seadramon

From Multiversal Omnipedia

Seadramon was a giant Champion-level sea Digimon that hides underwater for long periods of time, waiting for prey. It loves challenges, and can thus be easily goaded into battle. When encountered by the Digidestined, the creature was defeated by Garurumon. Seadramon can digivolve to MegaSeadramon.