My stab at SM Stall

Sableye-Mega @ Sablenite
Ability: Prankster
EVs: 252 HP / 252 Def / 4 Spe
Bold Nature
IVs: 0 Atk
- Protect
- Foul Play
- Recover
- Will-O-Wisp

Toxapex @ Rocky Helmet
Ability: Regenerator
EVs: 252 HP / 208 Def / 48 SpD
Bold Nature
IVs: 0 Atk
- Toxic Spikes
- Scald
- Recover
- Haze

Chansey @ Eviolite
Ability: Natural Cure
EVs: 8 HP / 252 Def / 248 SpD
Bold Nature
IVs: 0 Atk
- Stealth Rock
- Soft-Boiled
- Heal Bell
- Toxic

Skarmory @ Shed Shell
Ability: Sturdy
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Roost
- Spikes
- Brave Bird
- Whirlwind

Clefable @ Leftovers
Ability: Unaware
EVs: 252 HP / 64 Def / 192 SpD
Calm Nature
IVs: 0 Atk
- Moonblast
- Heal Bell
- Wish
- Protect

Reuniclus @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Calm Mind
- Psyshock
- Shadow Ball
- Recover