Cinderace - Gunk Shot is definitely not necessary. The fairies it can hit already take a bunch of damage from Pyro Ball, and Pyro Ball doesn't have as shaky accuracy as Gunk Shot. A suggestion for a replacement move that can counter Toxapex is Zen Headbutt.
252 Atk Libero Cinderace Zen Headbutt vs. 252 HP / 252+ Def Toxapex: 132-156 (43.4 - 51.3%) -- 3.1% chance to 2HKO
It requires quite a bit of prior damage to take out Toxapex guaranteed, but it's a reliable way to beat Toxapex.
Dragapult - Fire Blast is a really good move that can take out the steels that can wall the set you have. It has shaky accuracy, but is definitely worth it. I'd recommend replacing Sucker Punch for Fire Blast, as you already have good Dark STAB in Urshifu and Cinderace. Also change the nature to Lonely so that the Fire Blast damage isn't minimized.
Toxtricity, Urshifu, and Rotom-Wash are fine.
Clefable - Stealth Rock and Flamethrower aren't worth it imo. Stealth Rock and Defog on the same team can't synergize most of the time. Flamethrower leaves you with a lack of STAB and makes Clefable fail to check the things it's supposed to check offensively, like Dragapult, Hydreigon, etc. I think this set is better.
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Teleport
- Moonblast
- Wish
- Protect
Hope this helped!
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