It stores flammable gas in its body and uses it to generate heat. The yellow sections on its belly get particularly hot. (Sizzlipede)
Its body is covered in sweet nectar, and the skin on its back is especially yummy. Children used to have it as a snack. (Appletun)
Aided by the soft pads on its feet, it silently raids the food stores of other Pokémon. It survives off its ill-gotten gains. (Nickit)