Submarimon

Submarimon is the Armor Digivolved form of Armadillomon through the Digi-Egg of Reliability. His title is either "Spiralling Sincerity" (Japanese) or Guardian of the Sea, Reliable Guardian of the Sea, and Guardian of Reliability (English). Submarimon's head contains a cockpit that a single human can fit into.

Digimon Adventure 02: D-1 Tamers
Ryo can use Submarimon once he buys and equips the DigiEgg of Knowledge to Armadillomon.

Digimon Digital Card Battle
Submarimon is the second Armor Digivolution you can get for Armadillomon. He is a Blue Card. He is also the 4th opponent on Igloo City's Extra Arena.

Digimon World 3
After obtaining the Digi-Egg of Reliability Submarimon can be used to transport you underwater between certain docks.

 Attacks
 * Oxygen Torpedo (Oxygen Homing): Fires Oxygen Torpedoes from his front part.
 * Submarine Attack (Aqua Vulcan): Fires water energy beams at the opponent from its drill nose.
 * Aqua Sinking (Submarine Attack): Rams the enemy with its drill nose.