Whamon

Whamon is a large Aquatic Digimon that can be either Champion or Ultimate depending on how powerful he is. In the Japanese version, they are named as "Whamon" and "Whamon Perfect" respectively.

Whamon are the Net Ocean's sworn protectors. Their enormity is of the highest class in the Digital World. Due to their enormity, they have so much data that normal computers cannot process them.

While the Whamon off the coasts of File Island are referred to as Whamon Champion, the Whamon that live along the coast of the continents of Folder and Server, exceed both attack power and life force and were therefore referred as Whamon Ultimate.

Digimon Adventure 02
Whamon appeared to help rescue the other Digi-Destined from within the off-shore oil platform while Ikkakumon battled a MegaSeadramon under the control of the Dark Spiral (also saying that he lost a couple of pounds). Another one appeared in Australia near the Great Barrier Reef. It was unknown if that one had a DigiDestined partner.

Digimon Tamers
A Whamon was among the Digimon seen through the rip in the sky during Vikaralamon's rampage.

Digimon Frontier
After escaping from the Castle of Crystal, the DigiDestined ended up in an undersea cavern. It was there they met a claustrophobic Whamon. It seemed, that when Grumblemon was taking Fractal code from the land, Whamon ended up getting sucked in by the void left behind and was trapped. But before he did, he ate a mass of seaweed that held the Beast Spirit of Thunder. After MetalKabuterimon defeated Grumblemon, the stress from the battle caused the undersea cavern to flood. But Whamon carried the DigiDestined to safety. In gratitude for getting him out of there, Whamon took them to the nearest piece of land at the Toucanmon paradise.

Digimon World
Whamon can be yours by evolving Betamon. It can also come to the city. Once you have destroyed the Bandits for the second time you'll find a Whamon in Freezeland. He has some trouble and he brings you to his cave. The bandits will appear when you get there. They are Ogremon, Gabumon and Waruseadramon. When you defeat them then Whamon will come to the city and act like a ferry.

Digimon World 2
Whamon digivolves from Dolphmon and Ikkakumon, and can digivolve to MarineAngemon.

Digimon World 3
Whamon is found in Amaterasu City by fishing.

Digimon World DS
Whamon digivolves from Gekomon, and can digivolve into Plesiomon. Whamon is also found at the Under Sea Drive.

Digimon World Dawn/Dusk
Whamon digivolves from Dolphmon, and can digivolve to MarineAngemon.

Attacks 
 * Blasting Spout (Jet Arrow): Shoots a jet of water from his blowhole.
 * Tidal Wave: Swims round in circles to create a tsunami in all directions.
 * Mouth Sandwich Attack (口ではさむこうげき): Bites his enemy