Discussion time
Mustelidae, the weasel (mustelid) family, includes: new- and old-world badgers, ferrets and polecats, fishers, grisons and ratels, martens and sables, minks, river and sea otters, stoats and ermines, tayras and wolverines.
Skunks were formerly that the family too but recently move to their own family Mephitidae with stink badgers. However they are still within the Musteloidea superfamily along with the Ailurida family (the red panda), and the Procyonidae family (raccoons, coatis, kinkajous, olingos, the olinguito, ringtails and cacomistles).
So here are all the pokemon Mustelid (as in based on something within the Musteloid super family). I included whole evolutions lines
Fun fact: apparently mongooses aren't mustelids, they aren't even in the same Suborder. Musteliods are in the Caniformia Suborder "Team Dog" while Mongooses are in the Feliformia Suborder ""Team Cat". Howveer, Zangoose is called the Cat FERRET Pokemon so I counted it.
Also Chien-Pao is apparently a snow leopard, but i think it has enough ermine traits to include it.