Myotismon

Myotismon is an Undead Digimon whose name is derived from Myotis, a genus of bats (his Japanese name is a concatenation of "vampire" and "demon"). His design is derived from the Vampire.

Myotismon is a vampire dressed as an elegant gentleman, and feeds on the fresh or deleted data of his victims, who were thought to have been afflicted with sudden anemia. His power is decreased in the presence of the sun, so he creates a fog around him wherever he goes. He has demonstrated telekinetic abilities.

Digimon Frontier
A silhouette of Myotismon was seen outside the eating tent at the Autumn Leaf Fair.

Digimon World
Myotismon resides inside Greylord Mansion, where he is found starving. If fed a piece of meat, he explains what happened. After returning, he is held prisoner by SkullGreymon, whose defeat releases Myotismon.

Digimon World 2
Myotismon digivolves from IceDevimon or Devimon, and can digivolve to VenomMyotismon

Digimon World 3
Myotismon digivolves from Devimon and can digivolve to MaloMyotismon.

Digimon Digital Card Battle
Myotismon belongs to the Dark card group.

Digimon World DS
Myotismon digivolves from Devimon and can digivolve to VenomMyotismon or MaloMyotismon. Myotismon also appears in Chrome Mine.

Digimon World Data Squad
In Sneyato Forest, Bakemon Digivolved into Myotismon during it's fight with the DATS members. With info from a mysterious person, Myotismon ended up defeated.

Attacks
 * Grisly Wing (Night Raid): Summons his Alpha Bats (born from his own data) to attack or gather data from his victims. This attack can also steal his enemies' sight.
 * Crimson Lightning (Bloody Stream): Creates a red energy stream that he can throw out like a whip.
 * Nightmare Claw (Dead Scream): Sends out a black, translucent, ghost-like entity that turns the victim black and paralyzes them.
 * Nightmare Wave: Fires electricity which amplifies the target's doubts and mistrust.