Gulpin, the Stomach Pokémon. Gulpin is able to swallow items of its own size whole, as its stomach compresses most of its body. Its unique stomach acid allows it to digest almost anything.
– Ash’s Pokedex
Gulpin has one of the best faces, /3\ . Its species is the Stomach Pokemon, and its Pokedex entries say that most of its body is a stomach. Qutie a strange basis for a Pokemon indeed.
Stat-wise, it has good HP. Its defenses are higher than offensive stats, and is rather slow. It learns many status moves by level-up, including Toxic. As expected, it learns Swallow and Spit Up by level-up, as well as Gastro Acid.