Vademon

Vademon is an Alien Digimon whose name is derived from "Invader". It is shaped like something that came from the far reaches of the cosmos, but it's rumored that it was born from the seed of a plant. It could not be imagined from its overdeveloped head and octopus-like lower body, but it carries terrifying offensive power.[2]

Digimon Adventure
When Koushiro "Izzy" Izumi and Tentomon fell into his pocket dimension, Vademon convinced Izzy to give up his curiosity (his heart in the Japanese version) but Pabumon helped Izzy get it back. But at the same time, DemiDevimon wanted Vademon to sell him Izzy's crest. A fight ensued and resulted with Kabuterimon Digivolving to MegaKabuterimon and beating Vademon, collapsing his pocket dimension.

In Ultima, this same Vademon is.

Attacks
 * Unidentified Flying Kiss (悪魔の投げキッス Akuma no Nage Kissu?, lit. "Demon's Blown Kiss") : Makes a complete fool out of the opponent by blowing them a kiss before hurling meteors and planets at them.
 * Alien Ray (アブダション光線 Abduction Kousen?, lit. "Abduction Ray") : Fires a beam from the ray gun in its hand.