Ankylomon

Ankylomon is a Dinosaur Digimon who is completely covered in armour. His name comes from the dinosaur ankylosaurus. His defense can repel any attack and he attacks with the hammer on the end of his tail.

Digimon Tamers
In the first episode of Digimon Tamers, when Takato drops all of his cards an Ankylomon card can be seen.

Digimon Digital Card Battle
Ankylomon is one of the opponents in Igloo City's Extra Arena. His card can also be obtained, and is Yellow, making him of the Rare type.

Digimon World DS
Ankylomon digivolves from Armadillomon, and can digivolve further into Seahomon depending on its stats and if it's holding the Digi-egg of Light.

Digimon World Dawn/Dusk
Ankylomon digivolves from Armadillomon.

Digimon World Championship
Ankylomon is a digivolution of Armadillomon and can digivolve into either Triceramon, SkullGreymon, or Scorpiomon.

Attacks
 * Tail Hammer: Uses the spiked end of his tail as a hammer.
 * Megaton Press: Leaps into the air and slams his body onto his opponent.
 * Armored Stampede: Charges forward and headbutts the enemy with his massive weight.
 * Knockout Beat (Rhythmical Knock): Slams forefeet down into the ground to cause pillars of earth to shoot up from the ground and slam into the foe.