Megadramon

Megadramon is an Ultimate Level Dark Dragon Digimon. His counterpart is Gigadramon.

Digivolution

 * Baby - Botamon
 * In-Training - Koromon
 * Rookie - Betamon
 * Champion - Airdramon
 * Ultimate - Megadramon
 * Mega - ????

Special Digivolution

 * DNA - Kokatorimon + Kuwagamon = Megadramon

Attacks

 * Darkside Attack (shoots missiles out of his metal hands)
 * Parry Force

Digimon Adventure
Megadramon and Gigadramon worked for Machinedramon as his air troops. When Machinedramon was destroyed by War Greymon, it was unknown what became of them.

Digimon 02
A Megadramon was among the Digimon that crashed Yamato Ishida's concert at Christmas.

Digimon Tamers
When Rika Nonaka, Renamon, Kazu and Kenta appeared on a clockwork cloud plain where Clockmon and Hagurumon reside, they discovered a jammed clock and fixed it...BIG MISTAKE. That brought forth Megadramon who was imprisoned nearby. He plotted to load Renamon's data so that he could go to the Real World. Renamon became Kyubimon and battled him. When Megadramon overwhelmed Kyubimon, the legendary tamer Ryo Akiyama and his Digimon Cyberdramon appeared and Cyberdramon used his attack to send Megadramon back into the ground and Ryo rejammed the clock. It was unknown who sealed Megadramon up in the first place.

V-Tamer
Neo Saiba had Kokatorimon and Kuwagamon DNA Digivolve to Megadramon to fight Zeromaru. After tricky maneuvers and taking a beating from Zeromaru, Neo had Megadramon and Cherrymon DNA Digivolve into Ghoulmon.