The inside of a Jigglypuff, like that of a red giant star, is filled with helium. It is unknown how a pokemon came to have this unusual composition – most are made of carbon, hydrogen, and oxygen – but their ability to evolve with a Moon Stone suggests an extraterrestrial origin. Although they are capable of walking on land, it is also common to see a Jigglypuff drifting aimlessly through the skies.

It is this property which inspired the invention of the balloon. The first balloons were not made of rubber, but were Jigglypuff with strings tied to them, which would float thirty feet in the air for the purposes of observation and the amusement of children. The Jigglypuff were often unpleased with being used in this manner, and after one too many incidents of marker to the face, balloons made of non-living materials became popular instead.

This usage of Jigglypuff is still recalled in their ability to inflate and carry a rider for short periods of time. Occasionally they are controlled by a small fire-type pokemon held below it by the trainer in a way similar to a hot air balloon. They are not used for intercity flight, as they move slowly and can not stay aloft for longer than a couple hours. Nonetheless, when escaping from a mountain or a tall building, Jigglypuff are extremely valuable to trainers who do not have any large flying-type pokemon on their team.