252+ Atk Thick Club Marowak-Alola Shadow Bone vs. 252 HP / 172 Def Clefable: 231-273 (58.6 - 69.2%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Thick Club Marowak-Alola Fire Punch vs. 0 HP / 0 Def Magearna: 344-408 (114.2 - 135.5%) -- guaranteed OHKO
252+ Atk Thick Club Marowak-Alola Bonemerang (2 hits) vs. 0 HP / 0 Def Tapu Koko: 396-468 (140.9 - 166.5%) -- guaranteed OHKO
252+ Atk Thick Club Marowak-Alola Shadow Bone vs. 0 HP / 0 Def Tapu Koko: 252-297 (89.6 - 105.6%) -- 37.5% chance to OHKO
252+ Atk Thick Club Marowak-Alola Fire Punch vs. 248 HP / 252+ Def Klefki: 296-350 (93.3 - 110.4%) -- 62.5% chance to OHKO
252+ Atk Thick Club Marowak-Alola Shadow Bone vs. 92 HP / 0 Def Azumarill: 264-312 (72.5 - 85.7%) -- guaranteed 2HKO
252+ Atk Thick Club Marowak-Alola Shadow Bone vs. 4 HP / 0 Def Tapu Bulu: 195-231 (69.1 - 81.9%) -- guaranteed 2HKO after Grassy Terrain recovery
0 SpA Clefable Moonblast vs. 248 HP / 8 SpD Marowak-Alola: 59-69 (18.2 - 21.3%) -- possible 5HKO
252 SpA Magearna Twinkle Tackle (195 BP) vs. 248 HP / 8 SpD Marowak-Alola: 189-223 (58.5 - 69%) -- guaranteed 2HKO
252 SpA Magearna Fleur Cannon vs. 248 HP / 8 SpD Marowak-Alola: 126-149 (39 - 46.1%) -- guaranteed 3HKO
252 SpA Choice Specs Tapu Koko Dazzling Gleam vs. 248 HP / 8 SpD Marowak-Alola: 93-111 (28.7 - 34.3%) -- 3.4% chance to 3HKO
0- Atk Klefki Foul Play vs. 248 HP / 0 Def Marowak-Alola: 152-180 (47 - 55.7%) -- 74.6% chance to 2HKO
Marowak can check and counter 1 or 2 of Clefable, Tapu Koko, Magearna, and Klefki when its not behind screens, and Azumarill or Tapu Bulu cannot switch in, giving room to the rest of its team to better counter whoever Marowak decides not to beat.
252+ SpA Choice Specs Volcanion Sludge Wave vs. 252 HP / 84+ SpD Clefable: 310-366 (78.6 - 92.8%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Choice Specs Volcanion Sludge Wave vs. 92 HP / 0 SpD Azumarill: 410-484 (112.6 - 132.9%) -- guaranteed OHKO
252+ SpA Choice Specs Volcanion Sludge Wave vs. 0 HP / 0 SpD Tapu Koko: 432-510 (153.7 - 181.4%) -- guaranteed OHKO
252+ SpA Choice Specs Volcanion Fire Blast vs. 252 HP / 4 SpD Klefki: 662-780 (208.1 - 245.2%) -- guaranteed OHKO
252+ SpA Choice Specs Volcanion Fire Blast vs. 0 HP / 4 SpD Magearna: 524-618 (174 - 205.3%) -- guaranteed OHKO
Sludge Wave OHKOs everything except Magearna and Klefki. Fire Blast OHKOs everything except Azumarill and Clefable. Clefable doesn't do anything to Volcanion and you can just switch out of Azumaril and come back later so you can just click Fire Blast freely until everything is dead or if they sack Mag and Klef.