Drapion @ Black Sludge  
Ability: Battle Armor  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Swords Dance  
- Substitute  
- Knock Off  
- Poison Jab  

Gengar @ Choice Scarf  
Ability: Cursed Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Shadow Ball  
- Sludge Wave  
- Dazzling Gleam  
- Trick  

Vileplume @ Black Sludge  
Ability: Effect Spore  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Giga Drain  
- Strength Sap  
- Sleep Powder  
- Sludge Bomb  

Weezing-Galar @ Black Sludge  
Ability: Levitate  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Defog  
- Will-O-Wisp  
- Flamethrower  
- Strange Steam  

Salazzle @ Heavy-Duty Boots  
Ability: Corrosion  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Protect  
- Disable  
- Flamethrower  
- Toxic  

Toxapex @ Black Sludge  
Ability: Regenerator  
EVs: 248 HP / 8 Def / 252 SpD  
Calm Nature  
- Knock Off  
- Scald  
- Haze / Baneful Bunker
- Recover  

or

Toxapex @ Black Sludge  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Baneful Bunker  
- Scald  
- Haze  
- Recover