Dorimon

Dorimon is a Lesser Digimon and a carrier of the X Antibody whose name is derived from the onomatopoeia for drifting (「ドリドリ」), and as such it is often running. It can run very quickly if it is going straight. It is often running wild because it hates to be domesticated, and it is dangerous because it will recklessly charge at and ram anyone who approaches it. Its ears have grown sharp and hard, and because they also act as horns there is some small damage from its ramming attacks. However, it can't turn when going at speed.

Digimon World DS
Dorimon can be obtained by accumulating a certain amount of Tamer Points. He can then digivolve into Dorumon, Armadillomon, or Aruraumon depending on his stats. but his mega form isnt alphamon

Digimon World Dawn/Dusk
Dorimon can be obtained by degenerating an Armadillomon, a Shamanmon, or a Dorumon with level 4.

Digimon Pendulum X 1.0/1.5
Attacks
 * Metal Drop: Spits an iron bead from its mouth while charging at the opponent.
 * Charge: Runs at his enemy and tackles them.

Digimon Battle
Dorimon can be obtained during a special event.