Salazzle (F) @ Black Sludge  
Ability: Corrosion  
EVs: 248 HP / 8 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Toxic  
- Substitute  
- Protect  
- Flamethrower  

Drapion @ Black Sludge  
Ability: Battle Armor  
EVs: 252 HP / 4 Def / 252 SpD  
Careful Nature  
- Knock Off  
- Poison Jab  
- Toxic Spikes  
- Taunt  

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

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  

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

Rock Star (Toxapex) @ Life Orb  
Ability: Merciless  
EVs: 248 HP / 252 Atk / 8 Def  
Brave Nature  
IVs: 0 Spe  
- Gunk Shot  
- Liquidation  
- Knock Off  
- Recover  

or

Toxapex @ Black Sludge  
Ability: Regenerator  
Happiness: 160  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
- Knock Off  
- Haze  
- Scald  
- Recover