Armadillomon is a Mammal Digimon whose name and design are derived from the armadillo. Its body is covered in a hard shell. It has a carefree, charming personality, but occasionally gets hurt if it gets carried away. Just like Veemon and the others, Armadillomon is a descendant of an ancient species, so it is able to perform special Armor Digivolutions.
Some Armadillomon were seen at the Autumn Leaf Fair.
When the Chameleonmon under Petaldramon were purified by Tommy Himi (Kumamon) they reverted to Armadillomon.
An Armadillomon who digivolves from a line 4 Upamon will digivolve to Ankylomon, and one who digivolves from a line 20 Upamon can digivolve to Ankylomon without a Digi-Egg and Angemon with one. Any Armadillomon can digivolve to Digmon with the Digi-Egg of Knowledge and Submarimon with the Digi-Egg of Reliability.
Armadillomon is the first opponent in Igloo City's Extra Arena. He can also be obtained as a Partner Yellow Card, whose Armor Digivolutions are Digmon with the Digi-Egg of Knowledge and Submarimon with the Digi-Egg of Reliability.