Octomon

Octomon is a Champion level Octopus Digimon that the Digivolved form of Syakomon.

Digimon 02
The Syakomon belonging to the Chinese Digi-Destined the Poi Brothers Digivolved into these Digimon to fight a Mojyamon. They knocked him to the ground before Hikari Kamiya and Koushiro Izumi arrived with Angewomon and Mega Kabuterimon and as well as Gennai's Chinese counterpart Jackie who tell them that the Mojyamon isn't evil. One of the Octomon was used to help the army at the India/Chinese border know in ink writing that the Digimon there come in peace.

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