Armageddemon

Armageddemon is the Digivolve form of Diaboromon. He only made one appearance, in Digimon 02; Revenge of Diaboromon.

Appearance
Armageddemon's sheer size is so large, that he couldn't returned to the internet. He looks like a combination of an insect and a dinosaur.

Digimon Adventures 02
Diaboromon managed to get killed in the Digital World, however he planned this.This proved to be a mistake, because, Diaboromon's offsprings, Kuramon combined and formed Armageddemon. This allowed Armageddemon to release his Destiny Destroyer at point blank range upon Omnimon. After defeating Omnimon, he also made short work of Imperialdramon Fighter Mode. The combined power of WarGreymon and MetalGarurumon created the Omni Sword, reviving Imperialdramon and creating Imperialdramon Paladin Mode whose Omni Sword attack ultimately killed Armageddemon, releasing all the Kuramon's who were forever sealed within the Omni Sword, ending Diaboromon's rampage.

Attacks

 * Destiny Destroyer
 * Full Scale Attack

Trivia
Even though Armageddemon is the Digivolved form of Diaboromon, which is a Mega class Digimon, Armageddemon is still a Mega class Digimon.