Armageddemon

Armageddemon is a fictional character from the Digimon franchise, the alternative Mega form of Diaboromon. Armageddemon was created when an unbelievably large amount of Kuramon came together, fused and mutated. A brutal Digimon with an unknown attribute, his power surpasses Diaboromon's.

Description
He resembles a very large Lizard with 6 insectoid legs.

Digivolution

 * Fresh (Baby I) - Kuramon
 * In-Training (Baby II) - Tsumemon
 * Rookie (Child) - Keramon
 * Champion (Adult) - Chrysalimon
 * Ultimate (Perfect) - Infermon
 * Mega (Ultimate) - Armageddemon

Attacks

 * Destiny Destroyer (Ultimate Flare): Armageddemon fires a wave of destructive energy from his mouth.
 * Full Scale Attack (Black Rain): Launches a swarm of missile-like projectiles from his back.

Revenge of Diaboromon
After Omnimon defeated Diaboromon for the 2nd time, Diaboromon split into many Kuramon and appeared in the Real World to rejoin the other Kuramon who had been there since before the battle on the internet ensued. All the Kuramon soon gathered at Tokyo Bay near the Rainbow Bridge and merged, forming Armageddemon. He easily defeated Omnimon and Imperialdramon Fighter Mode. Then Imperialdramon was energized by the Omni Sword to become Imperialdramon Paladin Mode. He then defeated Armageddemon, reverting him to a lot of Kuramon and sending them back to the Digital World.

Digimon World 3
Armageddemon appears in the opening video, and can be fought near the end of the game.

Digimon World DS
Armageddemon appears before the final boss

Trivia

 * He was named after "Armageddon", the Biblical place where the final battle between good and evil is prophesied to be fought at the end of the world.