Octomon

Octomon is a Mollusk Digimon that resembles an octopus. It is the digivolved form of Syakomon. He was discovered from a virus program. They are best known for battling with a blowdryer which also doubles as a gun.

Digimon Adventure 02
The three Syakomon that belonging to the Poi Brothers Digivolved to Octomon to fight a Mojyamon until Kari Kamiya and Angewomon and Izzy Izumi and MegaKabuterimon arrived with Jackie (Gennai's Chinese counterpart) to tell them that Mojyamon wasn't evil. One of the Poi Brothers and his Syakomon went to the India/China Border where his Octomon used his Spurting Ink Strike to write "We Come in Peace" on a cliff wall.

Digimon Tamers
2 Octomon were among the Digimon seen through the rip in the sky during Vikaralamon's rampage.

Digimon Adventure V-Tamer 01
Octomon was one of Lord Marine's henchmen.

Digimon World 2
Octomon digivolves from Otamamon and Syakomon and can Digivolve to Dragomon. DigimonDusk/Dawn Betamon digivoles into Octomon. Attacks
 * Spurting Ink Strike (海鳴墨銃): Shoots ink out of its gun.
 * Insincerity (フジツモン Fujitsumon)
 * Octopus Trap: Traps his enemies with his tentacles.