Uxie @ Mental Herb
Ability: Levitate
EVs: 252 HP / 252 Def / 4 SpD
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Memento
- Magic Coat
- Trick Room
- Stealth Rock

Crabominable @ Life Orb
Ability: Iron Fist
EVs: 252 HP / 252 Atk / 4 SpD
Brave Nature
IVs: 0 Spe
- Ice Hammer
- Close Combat
- Stone Edge
- Earthquake

Magearna @ Shuca Berry
Ability: Soul-Heart
EVs: 252 HP / 252 SpA / 4 SpD
Quiet Nature
IVs: 0 Atk / 0 Spe
- Ice Beam
- Thunderbolt
- Flash Cannon
- Trick Room

Camerupt-Mega @ Cameruptite
Ability: Solid Rock
EVs: 248 HP / 252 SpA / 8 SpD
Quiet Nature
IVs: 0 Atk / 0 Spe
- Flamethrower
- Earth Power
- Ancient Power
- Hidden Power [Ice]

Cresselia @ Colbur Berry
Ability: Levitate
EVs: 252 HP / 252 Def / 4 SpD
Relaxed Nature
IVs: 0 Atk / 0 Spe
- Ice Beam
- Moonlight
- Trick Room
- Lunar Dance

Crawdaunt @ Waterium Z
Ability: Adaptability
EVs: 252 HP / 252 Atk
Brave Nature
IVs: 0 Spe
- Crabhammer
- Aqua Jet
- Knock Off
- Swords Dance

notes:

crab is actually bad af but its my fave gen 7 mon so i wanted to see how it fared in OU. its so strong and has fantastic coverage. originally crawdaunt was LO but adaptability Vortex pummels the tier, making the most of Trick Room turns. Cresselia was originally Mental Herb but changed to Colbur for emergency trick room versus Bisharp (+2 252+ Atk Life Orb Bisharp Knock Off (97.5 BP vs. 252 HP / 252+ Def Colbur Berry Cresselia: 278-329 (62.6 - 74%))

CC Calcs:
252+ Atk Life Orb Crabominable Close Combat vs. 252 HP / 4 Def Celesteela: 274-325 (68.8 - 81.6%)
252+ Atk Life Orb Crabominable Close Combat vs. 252 HP / 252+ Def Celesteela: 200-238 (50.2 - 59.7%)
252+ Atk Life Orb Crabominable Close Combat vs. 0 HP / 0 Def Keldeo: 309-367 (95.6 - 113.6%)

Hammer Calcs:
-1 252+ Atk Life Orb Iron Fist Crabominable Ice Hammer vs. 252 HP / 216+ Def Landorus-Therian: 608-717 (159.1 - 187.6%)
252+ Atk Life Orb Iron Fist Crabominable Ice Hammer vs. 252 HP / 4 Def Celesteela: 274-325 (68.8 - 81.6%)
252+ Atk Life Orb Iron Fist Crabominable Ice Hammer vs. 252 HP / 252+ Def Celesteela: 200-238 (50.2 - 59.7%)
252+ Atk Life Orb Iron Fist Crabominable Ice Hammer vs. 240 HP / 72+ Def Mew: 242-285 (60.3 - 71%)
252+ Atk Life Orb Iron Fist Crabominable Ice Hammer vs. 252 HP / 252+ Def Clefable: 250-294 (63.4 - 74.6%)

Quake Calcs:
252+ Atk Life Orb Crabominable Earthquake vs. 0 HP / 0 Def Magearna: 281-333 (93.3 - 110.6%)
252+ Atk Life Orb Crabominable Earthquake vs. 92 HP / 0 Def Mawile-Mega: 263-309 (99.6 - 117%)
252+ Atk Life Orb Crabominable Earthquake vs. 252 HP / 192+ Def Toxapex: 177-208 (58.2 - 68.4%)

Crawdaunt Waterium Calcs:
252+ Atk Adaptability Crawdaunt Hydro Vortex (180 BP) vs. 252 HP / 4 Def Magearna: 360-424 (98.9 - 116.4%)
252+ Atk Adaptability Crawdaunt Hydro Vortex (180 BP) vs. 248 HP / 240+ Def Zapdos: 328-388 (85.6 - 101.3%)
252+ Atk Adaptability Crawdaunt Hydro Vortex (180 BP) vs. 252 HP / 4 Def Celesteela: 396-466 (99.4 - 117%)
252+ Atk Adaptability Crawdaunt Hydro Vortex (180 BP) vs. 0 HP / 0 Def Greninja: 282-332 (98.9 - 116.4%)