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A machine dragon Digimon able to fire an infinite round of missles from it's hands.
Megadramon is a Dark-Dragon-Digimon whose name and design are derived from "Mega Dramon". It boasts the strongest and wickedest power among Dragon-type Cyborg Digimon of the Ultimate level. As a Digimon that was artificially remodeled by someone, it was programmed to destroy everything. It can surely be said that its very existence is a computer virus. It can easily penetrate computer networks protected by strong security, and can very easily destroy and then completely reformat the host computer.
In Digimon Adventure:
Megadramon and Gigadramon worked for Machinedramon as air troops, and bombed Machinedramon's city in order to destroy the Digidestined. It was unknown what happened to them when Machinedramon was destroyed by Wargreymon.
In Digimon World (the game) :
Megadramon is digivolved by Devimon, Tyrannomon, Airdramon,or Seadramon. To digivolve it you need to train your champ digimon up to 3000 HP, 5000 MP, Off 500, Def 300, Speed 400, Brains 400, 55kg and 10 or less care mistakes. (Bonus Condition: 30+ battles). A wild Megadramon appears as the second boss in Mt. Infinity. Megadramon is not a required boss fight; the player has the option of fighting it. Megadramon is the only enemy with the powerful mechanical technique DG Dimension, except Giromon. Once defeated, he joins the city's arena. He randomly appears outside of the arena building, bragging about his strength. He sometimes fights in the grade A/S tournaments.
In Digimon Xros Wars:
Several Megadramon are part of Dorbickmon's army in Dragon Land. They first emerge with the rest of the army to chase Dracomon, but are driven back by MetalGreymon and the rest of Blue Flare. They are later defeated when Shoutmon digivolves to Omegashoutmonand beats them all back.