VenomMyotismon

VenomMyotismon is an Evil Digimon. He is a demon beast that has the lower half of a beast and an upper half with a beetle-like shell, and is the true Digivolved form of the king of darkness, Myotismon. As VenomMyotismon, who has unleashed his hidden power, he has nothing but omnicidal and destructive impulses, and Myotismon, who originally maintained his gentlemanly conduct, reason, and intelligence, hates exposing his true, ugly form.

LOTM: Darkness Incarnate - Liberation of Mobius
Myotismon took this form as he fought against Sonic in the final battle.

Legends of the Multi-Universe (Menslady's story)
Myotismon briefly took this form as he was transforming into SuperNeoMyotismon.

Powers

 * Venom Infusion (Venom Infuse): Injects a destructive computer virus within the body of the enemy Digimon, destroying all of their configuration data and terminating their functions.
 * Inferno
 * Chaos Flame: Fires purple flames from his abdomen.
 * Tyrant Savage: Swipes at the opponent with a flaming claw.
 * Nightmare Claw