Digmon

Digmon is the Armor Digivolved form of Armadillomon through the Digi-Egg of Knowledge. His digivolution line is either "Steel Knowledge" (Japanese) or "The Drill of Power/Knowledge" (English). In the English version, he initially says "The Drill of Power," but changes it to "The Drill of Knowledge". He claims that "it makes [him] sound smarter." The "fingers" of his main two hands are drills, a quality which allows him to dig through the ground.

Digimon Tamers
Digmon made a minor cameo role when Takato used the Digmon's Drill card to "Digi-modify" Guilmon, before fighting Sandiramon.

Digimon Frontier
Some Digmon were seen at the Autumn Leaf Fair and the Great Trailmon Race.

Digimon Data Squad
While being pursued by and battling Marcus Damon, Thomas H. Norstein, Agumon, and Gaomon a Drimogemon morphed into a large Digmon after escaping to a strange crystalline cavern. Had Agumon and Gaomon been at full health they could've defeated Digmon easily; as they were in poor health at that moment he proved to be too much for the two, who had Digivolved to GeoGreymon and Gaogamon. However, Digmon was ultimately destroyed by a combination of GeoGreymon's Mega Flame and Gaogamon's Spiral Blow attacks.

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

Digimon Digital Card Battle
Digmon is the 1st Armor Digivolution you can obtain for Armadillomon. He is a Yellow Card. Also, he is the 3rd opponent in Igloo City's Extra Arena.

Digimon World 3
After you obtain Digi-Egg of Knowledge Digmon can be used to move you through the underground and move between certain holes in the ground.

 Attacks
 * Gold Rush: Fires his drills at the opponent.
 * Rock Cracking (Big Crack): Rams his drills in the ground and causes a fissure.