The sky will be darkened by the wings of many bats. The fallen people will invoke the name of the Undead Digimon King, and when the clock strikes at the hour of the beast, the Undead King will reveal himself in his true form as the beast. Then Angels will shoot arrows of Hope and Light at the love ones of those they have been sent to protect and a miracle will happen. - Prophecy-
Venom Myotismon was around for only two episodes, Prophecy and Battle For Earth. He is the Mega form of Myotismon. Little is known about Venom Myotismon. He did give the Digi Destined and their Digimon trouble for a brief period of time. War Greymon drilled a hole through Venom Myotismon revealing a strange little beast from within. This lead to the downfall of the Undead King. Talk about a very short reign as King. I learned that his attacks are Nightmare Claw and Venom Infusion. I have to thank the book I bought at the store for the information about his powers.
The following are interesting quotes taken from the two episodes.
"I'll begin with a little snack" -Venom Myotismon eats Demi Devimon."
"I shall enjoy devouring you, Angelfood is one of my favourites."
"Your miserable attempt to stop me has failed, now you will pay!"
"You think you can defeat me? You only unleashed the beast within, nyahh!"
"Now I will devour all you so called Digi Destined. You have stand in my way for the last time."
"Curse you Digi Destined, curse you and your lousy crests."