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Fuck your Team Rocket and your Giovanni shit. Let's talk about a real villain. Myotismon.
Prior to becoming Myotismon, he was known as Devimon; a powerful Champion level Digimon that split the Digidestined up across File Island and used his Black Gears to take control of other Digimon by shoving them in their backs. If I recall correctly, his minion was Ogremon at that time. So there's strike 1: separating children and attempting a divide and conquer with those children.
He was then killed by Angemon, the digivolved version of Patamon (T.K's partner digimon) when he did his Hand of Fate attack and shone a beam of light from his hand which pierced Devimon in the heart. At this time, he was thought to be dead. Nope.
He actually revived into Myotismon, an Ultimate level Digimon who tortured his minions, actually sets out to KILL a child (which happens to be the eighth Digidestined Kari, he doesn't succeed however) and invades the real world causing chaos and destruction everywhere.
He was then killed when Kari's partner digimon Gatomon (who was formerly Myotismon's goon) digivolved into Angewomon, and slayed the vampire-esque Myotismon with Celestial Arrow.
Then Myotismon came back as Mega level VenomMyotismon. Giant Godzilla like beast. To defeat this terror, Tai and Matt had to get FUCKING SHOT IN THEIR HEARTS by Angemon and Angewomon to trigger the digivolution of Agumon and Gabumon to Mega level digivolve into Wargreymon and Metalgarurumon.
Of course, he was thought to be dead after this when the Dark Masters made their debut and the final Digimon villain Apocalymon came afterwards. NOPE.
He made a return in the second season of Digimon as the final Digimon villain MaloMyotismon. And this cunt was fucked up to the core.
He possessed a shitload of kids and took them in trucks. Warped himself into a human being; Yukio Oikawa then in the final battle he used his Mental Illusion attack to trap the Digidestined children into a delusional state.