Name(s): Spritzee, Aromatisse
Type: Poison / Fairy
Justification: I remember when we (or at least when I) first saw Spritzee, people were saying that it could potentially evolve into a plague doctor Poison / Fairy. While it didn't exactly evolve into what we expected, I still feel like there are enough traits of the plague doctor in Aromatisse (and obviously Spritzee) that I can see it being Poison / Fairy. It would also let Aromatisse differentiate itself from the other Fairy-types. The movepool is a set of Poison-type moves that I could see it using. Nothing else is changed about it.
New Moves: Sludge Bomb, Venoshock, Poison Jab, Poison Sting, Clear Smog, Venom Drench
Removed Moves: None
Altered Abilities: None
Name(s): Musharna
Type: Fairy / Poison
Justification: Musharna feels more like a Fairy type than Psychic type (Munna is Fairy). It also evolves with a Moon stone and Fairies have a connection with the moon in this game- not to mention it learns Moonlight and is found in a placed called Dreamyard. Poison because of the dream smoke kind of sounds hallucinogenic if you ask me, but it has a more positive vibe which works well with Fairy.
New Moves: Poison Gas, Smog, Sludge Bomb, Sludge Wave, Clear Smog, Moonblast, Aromatic Mist, Draining Kiss, Misty Terrain
Removed Moves: Psychic, Stored Power, Psywave, Telekinesis, Skill Swap
Altered Abilities: Telepathy -> Levitate (Telepathy is more Psychic-related and Levitate because, it actually does, kind of like Weezing)
Name(s): Gulpin, Swalot
Type: Poison/Fairy
Justification: The exact origin of these designs is very much up in the air, and at least to me, they look like whimsical but troublesome fairies from some sort of local folklore (Ireland, etc). Gulpin has a feather in its hat, Swalot has a comical mustache and the two of them look like they could be the generic slime enemy you find outside your home town in any JRPG.
New Moves: Dazzling Gleam, Play Rough, Misty Terrain
Removed Moves: None
Altered Abilities: None
Name(s): Nidoqueen
Type: Poison/Fairy
Justification: Nidoqueen is the fully evolved form of the female nidoran, and even has queen in its name, and seeing how much the fairy type has in common with femininity i thought "why not"? Also having a different type that Nidoking helps it differentiate
New Moves: Moonblast, Play Rough, Dazziling Gleam
Removed Moves: Earth Power, Stone Edge, Stealth Rock, Sandstorm
Altered Abilities: None
Name(s): Vileplume (Oddish and Gloom remain Grass/Poison)
Type: Fairy/Poison
Justification: The Oddish lines seems to have an association with the moon, being able to learn Moonlight, and as of ORAS, Moonblast. The line also learns Dazzling Gleam by TM. The Pokedex also states that Oddish is nocturnal, being awoken only by moonlight.
New Moves: None
Removed Moves: None
Altered Abilities: None
Name: Venomoth
Type: Fairy/Poison
Justification: As has been pointed out many times in this thread, Fairy-type has a connection to the moon, and many species of moth are nocturnal. Also, I'm not even going to lie, ever since Twitch Plays Pokemon trashed Lance's Dragonite with nothing but ATV, I've been aching for a Fairy/Poison-type Venomoth, so that it can be a true Dragonslayer!
New Moves: Fairy Wind, Dazzling Gleam, Moonblast
Removed Moves: Silver Wind, Signal Beam, Bug Bite
Altered Abilities: N/A