Gesomon

Gesomon is a mollusk Digimon that resembles a giant squid.

Digimon Adventure
A Gesomon was seen as a henchmen of Myotismon. He appeared in a river where the Digi-Destined are. Ikkakumon fought and defeated him.

Digimon 02
A Gesomon was with an Ebidramon and a Shellmon when they chased an Australian Digi-Destined named Derek and his Crabmon. With the help of Ikkakumon and Armadillomon, Crabmon drove the three of them away with the thought of them as food. After Zudomon, Submarimon, and Coelamon defeated a Scorpiomon and took down the Control Spire, they were seen rounded up with a Whamon and a Raremon by the other Australian Digi-Destined.

Digimon Tamers
A Gesomon was among the many Digimon seen through the rip in the sky during Vikararamon's rampage.

Digimon Frontier
A Gesomon smaller than usual was among the victims of Ice Devimon when he had his Fractal Code absorbed by him.