Myotismon is one of the Villains in Digimon to last the longest. He is classified as a Virus and is referred to as a Ghost Digimon. That part is hard to swallow but that is what it says on his card. His attacks include, Grisly Wing, Nightmare Claw and Crimson Lightning. I think this is the order of Myotismons forms: Ultimate - Myotismon and Mega - Venom Myotismon. Myotismon is a minor Character in the early episodes. He makes his first Major appearance in Sora's Crest of Love, after that he has been shown in every episode until his demise in The Battle For Earth.

The episode that shows the true nature of Myotismon happens in Gatomon Comes Calling. You see him prey upon an innocent woman reveiling that he is a Vampire. That was no real surprise considering you see other signs in the earlier episodes, Carriage, Coffin, Bats and the fact that he prefers Darkness over Light.

Myotismon is one of the cruelest Digimon I have come across in the series. You see him punish his own servants for failure. Demi Devimon was punished in many unique ways, being chewed on by bats, forced to stay in a tree all night, being hung upside down over a flaming pit and the ultimate punishment Death. Gatomon was punished everytime she looked at Myotismon with a certain kind of eyes. Crimson Lightning was her punishment.

I am just guessing here that Myotismon was a threat to the Dark Masters for being so powerful. Each of the Dark Masters did not last as long as Myotismon.

Many will wonder why I pick Myotismon over the other Evil Digimon. I have always liked Vampires and Myotismon is that. He is arrogant, bold., fearless and just plain nasty, the perfect Villain.

Malomyotismon
Mega Digimon
Attacks: Phantom Illusion, Crimson Mist, Screaming Darkness.

Malomyotismon is another Mega version of Myotismon. After Venomyotismon
was defeated 3 years ago he took over a humans body and managed to
plot to weaken the Digital World. He made 2 digimon Arukenimon and
Mummymon. He also got Ken's Dark Spore and copied it and put it into
other children. These children's spores sprouted and flowers came.
These flowers gave Myotismon the power to return as Malomyotismon.
He sent the DD's except Davis who "doesn't have any worries" (what
about Kari Davis!!) to their own personal dreams. With help from the
Digimon they come back. All the DD's around the world use their
digivices to create light. This makes Malomyotismon weaker. The Dark
Spore children then have doubts and Darkness starts returning. But
with encouragement from the DD's they see the light and get digimon
and digivices and they help make Malomyotismon lose his body. His
shadow form is then blasted by Imperialdramon and he is deleted.