Submarimon

From the Digimon 02 series, he is a Machine Digimon who is the result of when Armadillomon uses the Digi-Egg of Reliabilty.

Pre-Evolution

 * Fresh (Baby) - Tsubumon
 * Baby (In-Training) - Upamon
 * Child (Rookie) - Armadillomon

Attacks

 * Oxygen Homing (Oxygen Torpedo): The name says it all.
 * Submarine Attack

Digimon 02
Armadillomon first became Submarimon on the day the Digi-Egg of Reliabilty was found, when the Digidestined were trapped in an oil refinery by a Dark Spiraled MegaSeadramon & had to send Cody to get help. When Cody got back, his understanding of how his lie saved lives evoked the Digi-Egg's power, allowing Armadillomon to Armor Digivolve to Submarimon, who destroyed the Dark Spiral on MegaSeadramon. Since then, Submarimon was a valuable fighter during the Digimon Emperor's reign of terror.

But once Ken renounced his evil persona, Submarimon was no longer needed & appeared only a few times as Ankylomon was used more. But during the battle with MaloMyotismon, Submarimon was manifested as a result of Cody's dream for justice.