Ah, that was the set I wanted to propose... Eh, whatever. Here is my proposition:
Darmanitan @ Leftovers
Trait: Sheer Force
EVs: 212 HP / 152 Atk / 144 Def
Impish Nature
- Encore
- Will-O-Wisp/Toxic
- Taunt
- Fire Punch
This is my supporter defensive Darmanitan set I've been testing out. Encore is a troll move to lock out set-up pokemon, while Taunt and WoW allow it to be a useful support pokemon. Fire Punch is the chosen STAB because it doesn't deal recoil damage, while still being powerful off Darmy's high Attack stat and Sheer Force. Toxic is also a great option over WoW because Darmanitan is a huge lure to bulky waters, which it can cripple on the switch, then switch out. Taunt + Toxic allows it to beat certain Heal Bell users. Overall, this is a nice set that abuses Darmanitan's big HP stat and support moves.