Poison mono

Tentacruel @ Leftovers
Ability: Clear Body
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Rapid Spin
- Scald
- Acid Spray
- Ice Beam

Muk-Alola @ Life Orb
Ability: Poison Touch
EVs: 252 HP / 252 Atk / 4 Def
Adamant Nature
- Shadow Sneak
- Poison Jab
- Power-Up Punch
- Crunch

Beedrill @ Beedrillite
Ability: Swarm
Shiny: Yes
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Fell Stinger
- Poison Jab
- Drill Run
- U-turn

Salazzle @ Choice Specs
Ability: Corrosion
Shiny: Yes
EVs: 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Dragon Pulse
- Sludge Bomb
- Flamethrower
- Fire Blast

Roserade @ Assault Vest
Ability: Natural Cure
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Dazzling Gleam
- Giga Drain
- Shadow Ball
- Sludge Bomb

Nidoqueen (F) @ Black Sludge
Ability: Poison Point
EVs: 4 HP / 252 Def / 252 SpD
Impish Nature
- Toxic Spikes
- Stealth Rock
- Taunt
- Dragon Tail