Infermon

Infermon is an Ultimate Level Unidentified Digimon. Its name is derived from the word infernal.

Evolution

 * Fresh (Baby I) - Kuramon
 * In-Training (Baby II) - Tsumemon
 * Rookie (Child) - Keramon
 * Champion (Adult) - Chrysalimon
 * Ultimate (Perfect) - Infermon
 * Mega (Ultimate) - Diaboromon/Armageddemon

Attacks

 * Spider Shooter (Hell's Grenade): Opens his mouth and a cannon comes out and fires.
 * Network Grenade (Coccoon Attack): He withdraws into his shell and thrusts himself at his enemies.

Digimon Adventure: Our War Game!
Keramon digivolved straight to Infermon, thus bypassing the Champion level. In this form, Greymon and Kabuterimon had a hard time fighting him. To defeat the powerful Digimon, they also planned to digivolve on their Ultimate Level but while there were digivolving, Infermon attacked them, resulting in their defeat. Infermon then escaped and hacked himself in the US military network, from where he launched a Nuclear missile on the DigiDestined. When Agumon and Gabumon attacked him and Warp Digivolved to WarGreymon and MetalGarurumon, he became Diaboromon and in this form he was able to defeat them.

Digimon Tamers
While Beelzemon was testing his new powers on a bunch of Chrysalimon, Calumon's power Digivolved the remaining Chrysalimon into an Infermon. However not even he could bring down Beelzemon, who destroyed him and absorbed his data.