Poison-types Koffing and Weezing are best known in-universe for spewing poisonous, explosive gas from their body. Originally from the Kanto region, Koffing and Weezing were made compatible in Pokemon Scarlet & Violet thanks to the Teal Mask. Now, trainers can catch a Koffing (or Weezing) of their own in Kitakami, the setting for Teal Mask/part 1 of The Hidden Treasure of Area Zero expansion pass.