Submarimon

Submarimon, the Reliable Guardian of the Sea (渦巻く誠実), is an Aquatic Digimon whose name and design are derived from "Submarine". It armor-digivolved through the power of the "Digi-Egg of Reliability". It has the "Water" attribute of that Digi-Egg, and those which don this Digi-Egg demonstrate their true might when underwater. It swims freely around the ocean, and as for the techniques which are unleashed during underwater battles, if the opponent is not a considerably aquatic Digimon, it will be unable to oppose them.

Digimon Adventure 02: Tag Tamers
Submarimon digivolves, for one round, from Armadillomon with a Digi-Egg of Reliability.

Digimon Tamers: Brave Tamer
The Submarimon card, titled "PF DM Seijitsu", allows Armadillomon to digivolve to Submarimon during battle.

Digimon Digital Card Battle
The Submarimon card is #176 and is an Ice-type Partner card with 850 HP, 0 DP, and 0 DP bonus. Its special effect reduces the opponent's attack power to 0, and its support ability is "Discard two cards from opponent's Online Deck. Draw one card."

Digimon World 3
Submarimon can be summoned at any dock once the player obtains the Digi-Egg of Sincerity. Submarimon will ferry the player across the ocean between certain docks, but must be piloted along the correct path. However, Dolphmon, Gesomon, and Divermon will often attack Submarimon while it is swimming.

Digimon Accel: Ultimate Genome
Submarimon digivolves from any Rookie Digimon if it doesn't fulfill the requirements for any other Champion Digimon. Submarimon digivolves to Chirinmon if it has between 0 to 5 Dark DNA data, 11 to 15 Aquan DNA data, and 20 Holy DNA data; to Cerberumon if it has between 0 to 5 Holy DNA data, 6 to 10 Aquan DNA data, and 20 Dark DNA data; to Piximon if it has between 0 to 5 Dark DNA data, 6 to 10 Holy DNA data, and 20 Aquan DNA data; or to Deramon if it doesn't fulfill the requirements for any other Ultimate Digimon. Submarimon can also DNA digivolve to Cerberumon with Togemon.

Attacks
 * Oxygen Torpedo (オキシジェンホーミング Oxygen Homing): Discharges super-compressed oxygen.
 * Submarine Attack (サブマリンアタック): Assumes a distance while underwater, then quickly rams the opponent while its nosetip drill is spinning.
 * Aqua Vulcan (アクアバルカン) : Fires water beams at the opponent from his drill.