What is a good moveset for Fezandipiti?

Question

If you have a good competitive moveset for Fezandipiti, post an answer below and upvote the best ones. Movesets for any of its pre-evolutions may also be shared on this thread.

Be sure to include full set details in your post, e.g. items, abilities, natures and EVs. Some explanation, including the intended game mode for your set, is also appreciated. Access the full list of guidelines here.

Fezandipiti Pokédex and learnset for reference.

Answer 1

Doubles Toxic Chain Abuser

Fezandipiti @ Ability Shield
Ability: Toxic Chain
Tera Type: Fairy / Dragon
EVs: 252 HP / 252 SpA / 4 Spe
Timid Nature
- Protect
- Dazzling Gleam
- Acid Spray / Venoshock
- Icy Wind / Heat Wave / Air Cutter / Tailwind

The whole idea with this set is to exploit Fezandipiti's absolutely BUSTED ability, Toxic Chain, in double battles. Basically, if Fezandipiti hits another Pokemon with an attack - not even a contact move, just an attack - it has a 30% chance to badly poison the target. Sure, all three members of the Loyal Three have this, but Fezandipiti has some pretty great spread moves to take advantage of that fact, which more than makes up for its weaker Special Attack, in my opinion. In fact, with a spread move like Dazzling Gleam, there's a 51% chance you badly poison at least one of your two opponents, assuming neither already has a status condition, and a 9% chance to badly poison both opponents in one go.

The main idea here is to pair Fezandipiti with a Neutralizing Gas Weezing. Weezing gets rid of your opponents' abilities, but with its Ability Shield, your Fezandipiti's Toxic Chain will remain just fine, totally unaffected. Which allows you to go to town. Protect is Protect (and with Weezing, not even an Urshifu can hit you) and it can help stall once you have a poisoned opponent on the ropes. Dazzling Gleam is a strong, STAB spread move, and your strongest attack with this set. Acid Spray is single-target, but the sharp Special Defense drop improves your team's offense. Venoshock is a bit more niche, but to a poisoned foe, you're hitting with a 130 base power STAB attack. These single-target moves also keep you from being completely walled by Wide Guard. The other three moves are all spread moves and coverage, with a few added effects. Icy Wind is the most valuable, offering Speed control, Heat Wave may burn a foe (bringing your odds of inflicting a status condition to at least one of two foes up to 60.31%) and Air Cutter has a heightened crit chance and is super effective against Ogerpon (except Cornerstone). Tera Fairy ups what little damage you do with Dazzling Gleam, while Tera Dragon offers some helpful resistances to Ogerpon (again, except Cornerstone). You can also run Tailwind for a more supportive role.

Sources:
https://bulbapedia.bulbagarden.net/wiki/Toxic_Chain_(Ability)
https://www.calctool.org/math-and-statistics/probability

Answer 2

Tailwind setter.

Fezandipiti @ Focus Sash
Ability: Toxic Chain
Shiny: Yes
Tera Type: Flying / Steel
EVs: 252 Atk or HP / 4 HP or Atk / 252 Spe
Jolly Nature
- U-turn
- Tailwind
- Gunk Shot
- Play Rough

Jolly Nature is to reach max Speed without Choice Scarf. Focus Sash is to guarantee you get the first Tailwind up. Gunk Shot and Play Rough is STAB. U-Turn is to switch. More Attack EVs (252) allows you to hit harder, but not really hit hard. More HP EVs (252) probably lets you survive a hit and set up a Tailwind again later.

Answer 3

Fezandipiti @ Covert Cloak / Leftovers
Ability: Toxic Chain
Tera Type: Grass
EVs: 252 HP / 144 Def / 112 Spe
Impish Nature
- Beat Up / Toxic
- Roost
- Taunt
- U-turn

P Spikes absorber, pivot and status inflictor.
~ Outspeeds up to maxed +nature base 70s
~ Beat up over toxic to inflict some damage and not be taunt bait but you can still run toxic if in a team with primarily special attackers
~ Grass to resist ground and water as well as grass