FusionDex

They propel themselves in the air with puffs of a white, toxic smog and repel attacks with a weak magnetic barrier. They typically will let themselves fall from the air to strike opponents below them using their metal bodies.

Getting up close to a Belfing will give you a chance to observe, through its thin skin, the toxic gases swirling inside. When Belfing gather in a swarm, they move in perfect unison as if they were but one Pokémon.