As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Weezing:
Did you know? It mixes gases between its two bodies. It’s said that these Pokémon were seen all over the Galar region back in the day. It can’t suck in air quite as well as a Galarian Weezing, but the toxins it creates are more potent than those of its counterpart.
Source: The Pokémon Company