Cotoise

Cotoise is a tortoise-like, quadrupedal Pokémon. It has a large, black, rock-like shell with holes that glow with a red warmth. Its skin is reddish-brown with gray-black bands on its legs and neck. It has a long neck and its eyes seem permanently closed. Cotoise lives in mountains and volcanic areas, where it looks for large deposits of coal. It uses the coal to fill the hollow spaces in its shell and then burns it for energy.

Because coal is Cotoise's source of energy, it becomes immobile once it runs out of coal to burn. If the fire inside of Cotoise's shell goes out, it will die. A Cotoise is healthy if the smoke spouting from its shell has tremendous velocity. When it blows out smoke from its nostrils and the top of its back, it sounds like a locomotive horn. It blows black smoke out of its nostrils before fleeing and while being attacked.

(Source: Bulbapedia)