GigaSeadramon

GigaSeadramon is a Cyborg Digimon, the digivolved form of MegaSeadramon X. A Digimon also known as the "Gigantic Assault Landing Ship". Its even larger than a Whamon and is capable of transporting several Digimon inside itself.

Digimon World DS
GigaSeadramon digivolves from MegaSeadramon. It can also be found in Undersea Drive. The B.T. Boss was going to use a GigaSeadramon to fight the main tamer, but it was beat by a MarineAngemon.

Digimon World: Dawn/Dusk
In Digimon World Dawn/Dusk, GigaSeadramon is obtainable through DNA-Digivolution of Whamon and Gigadramon. Whamon must be at least Level 53 with Machine and Aquan at minimum 17,000 EXP each. You can also get him by DNA-Digivolution of Tylomon and Kenkimon. It can also digivolve from MegaSeadramon, but you must have already gotten GigaSeadramon to do so.

Attacks
 * Giga Sea Destroyer: Launches a strong energy torpedo from its mouth.
 * Sky Wave: Rain falls from the sky at fast speeds flooding its enemies.