Aggron are huge, black and gray, monstrous bipedal Pokémon. They stand on their hind legs and may use their arms to attack opponents and pick things up. They have a thick, long, black tail that they can swing at enemies and they have large armour plating on their body and head. Their face and head is covered in grey armor, with the uppermost, pointed plate possessing two pairs of holes on its upper section, with horns protruding from the foremost holes. These horns, which it uses to dig tunnels through bedrock when seeking food, grow a little longer at a time and can be used to determine the individual Aggron's age. Aggron's forehead plating extends past their upper jaws in a small point. Like its pre-evolutions, Aggron has sky-blue eyes, and a nostril-like hole on the tip of its upper jaw. On the rim of its mouth are several pointed, fang-like protrusions, and the nape of its neck and back have gray-colored armour sections. Aggron have pointed black bands on their shoulders, and grey bands on their arms and legs.