Immunity
The immune system of the Pokémon prevents it from getting poisoned.
Thick Fat
The Pokémon is protected by a layer of thick fat, which halves the damage taken from Fire- and Ice-type moves.
This gluttonous Pokémon eats constantly, apart from when it's asleep. It devours nearly 900 pounds of food per day.
Its stomach's digestive juices can dissolve any kind of poison. Eating things off the ground doesn't bother it at all.
This glutton appears in villages without warning and devours the entirety of their rice granaries—such occurrences have long been counted among the gravest of disasters.