The Gas Chamber - ToxicStall Team (Top 10 UU Suspect)

Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Hyper Voice
- Heal Bell
- Wish
- Protect

Gyarados @ Leftovers
Ability: Intimidate
Shiny: Yes
EVs: 248 HP / 208 Def / 52 Spe
Impish Nature
- Waterfall
- Roar
- Toxic
- Taunt

Tentacruel @ Black Sludge
Ability: Liquid Ooze
EVs: 232 HP / 252 Def / 24 Spe
Bold Nature
IVs: 0 Atk
- Rapid Spin
- Scald
- Toxic Spikes
- Haze

Sableye @ Leftovers
Ability: Prankster
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Will-O-Wisp
- Knock Off
- Taunt
- Recover

Ferroseed @ Eviolite
Ability: Iron Barbs
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
IVs: 0 Spe
- Spikes
- Gyro Ball
- Leech Seed
- Protect

Steelix-Mega @ Steelixite
Ability: Sheer Force
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Stealth Rock
- Earthquake
- Heavy Slam
- Toxic