Jigglypuff is filled with air as can be evidenced in Pokemon Stadium games, when defeated it will deflate and slowly float down to the ground.

It also has a pre-evolved form named Igglybuff which was introduced in generation two and it evolves into Jigglypuff through levelling up at the appropriate level of happiness. Jigglypuff is known for its intense popularity in Japan. It is usually fairly rare in pokemon games, and evolves into Wigglytuff via a Moon Stone. Overview Its Pokedex Number is 39 and it is a first generation Pokémon.