>>43915110252 Atk Life Orb Urshifu-Rapid Poison Jab vs. 252 HP / 4 Def Clefable: 294-346 (74.6 - 87.8%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Life Orb Urshifu-Rapid Surging Strikes vs. 252 HP / 4 Def Clefable on a critical hit: 308-364 (78.1 - 92.3%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Life Orb Urshifu-Rapid Surging Strikes vs. 252 HP / 252+ Def Toxapex on a critical hit: 65-77 (21.3 - 25.3%) -- possible 5HKO after Black Sludge recovery
252 Atk Life Orb Urshifu-Single Wicked Blow vs. 252 HP / 4 Def Clefable on a critical hit: 164-194 (41.6 - 49.2%) -- guaranteed 3HKO after Leftovers recovery
252 Atk Life Orb Urshifu-Single Wicked Blow vs. 252 HP / 252+ Def Toxapex on a critical hit: 138-164 (45.3 - 53.9%) -- 2% chance to 2HKO after Black Sludge recovery
Dark looks better in a vacuum, but then you have to remember Magearna is back and she cucks it pretty badly without Fire Punch. Rapid Style is much more concise on a Bulk Up set with Surging Strikes, Close Combat and Ice or Thunder Punch.
Single is forced to run Wicked Blow/CC/Fire Punch and probably Poison Jab.