Rate my poison monotype team and suggest a mon for the last slot.
Also post your monotype teams.

Tentacruel
@ Black Sludge/Leftovers
Nature- Calm
Ability- Liquid Ooze
Ev's: 252 HP, 224 SpDef, 32 Speed

-Toxic Spikes
-Venoshock
-Scald
-Ice Beam/Hex

Nidoking
@ Life Orb/Choice Scarf
Nature- Timid
Ability- Sheer Force
Ev's: 4 Def, 252 SpAtk, 252 Speed

-Earth Power
-Ice Beam
-Thunderbolt
-Flamethrower

Gengar
@ Gengarnite
Nature- Timid
Ability- Levitate
Ev's: 4 HP, 252 SpAtk, 252 Speed

-Protect
-Hex/Shadow Ball
-Sludge Bomb
-Focus Blast

Drapion
@ Assault Vest
Nature- Jolly
Ability- Battle Armor/Sniper
Ev's: 252 Atk, 4 Def, 252 Spe


-Crunch/Knock Off
-Rock Slide
-Earthquake
-Poison Jab

Weezing
@ Black Sludge/Leftovers
Nature- Bold
Ability- Levitate
Ev's: 248 HP, 252 Def, 8 SpDef

-Pain Split
-Flamethrower
-Thunderbolt
-Haze