Garganacl @ Leftovers  
Ability: Purifying Salt  
EVs: 240 HP / 16 Def / 252 SpD  
Sassy Nature  
- Substitute / Protect
- Salt Cure  
- Wide Guard  
- Recover
(Wide guard can be spammed forever, just not after protect)

Froot Luips (Toucannon) @ Kee Berry  
Ability: Skill Link 
EVs: 40 HP / 236 Def / 232 Spe  
Jolly Nature  
- Beak Blast  
- Feather Dance  
- Bullet Seed  
- Roost
(bringing back this phys wall from gen 7; no flyingnium but kee berry)

Munkidori (M) @ Black Sludge 
EVs: 4 HP / 252 Def / 4 SpD / 248 Spe  
Bold Nature  
IVs: 0 Atk  
- Trick  
- Protect  
- Psychic Noise  
- Substitute
(Tricking Black Sludge is rude; Using Psychic Noise to inflict toxic is diabolical)