MegaSeadramon

From the Digimon series, MegaSeadramon is a aquatic Digimon. He is the ultimate form of Betamon.

Evolution

 * Fresh (Baby) - Betamon
 * Baby (In-Training) - Koromon
 * Child (Rookie) - Betamon
 * Adult (Champion) - Seadramon, alternately Airdramon but Airdramon doesn't digivolve further.
 * Perfect (Ultimate) - Mega Seadramon, corrupted form WaruSeadramon
 * Ultimate (Mega) - MetalSeadramon

Attacks

 * Thunder Javelin
 * Maelstrom

First Season{Digimon Adventure}
One of the Digimon Myotismon brought to the real world. He was swimming around in Tokyo Bay during August 1 & 2. But on Augest 3rd, MegaSeadramon was given the task of preventing outside interference from the sea. When Jou Kido and Takeru Takaishi attempted to get into the city, MegaSeadramon attacked them at Rainbow Bridge. When Takeru was in peril, Jou realised it was up to him to save him, and his Crest began to glow for the first time. Ikkakumon digivolved to Zudomon and destroyed MegaSeadramon.

Second Season(Digimon 02)
One of the Digimon under the control of the Dark Spirals, MegaSeadramon trapped the DigiDestined in an offshore oil platform. Iori Hida was able to escape in a submersible, and called on Jou for help. As Ikkakumon held MegaSeadramon off, Jou and Whamon freed the kids. Iori then picked up and activated the Digimental of Reliability, and Armadillomon became Submarimon. Submarimon and Ikkakumon then worked together to destroy the Dark Spiral controlling MegaSeadramon. Some time later, the DigiDestined called on Ikkakumon to help them protect the sixth HolyStone from Black War Greymon. Besides the Dolphmon, Ikkakumon called the very same MegaSeadramon from to help out too. Despite the combined effort, however, Black WarGreymon parted the waters, washing the aquatic Digimon away, & destroyed the stone.