Mamoswine

Mamoswine @ Life Orb
Ability: Thick Fat
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Icicle Crash
- Earthquake
- Ice Shard
- Secret Power

Kyurem-Black @ Icium Z
Ability: Teravolt
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Ice Beam
- Fusion Bolt
- Hidden Power [Fire]
- Freeze Shock

Tapu Koko @ Choice Scarf
Ability: Electric Surge
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Wild Charge
- Brave Bird
- U-turn
- Defog

Magearna @ Assault Vest
Ability: Soul-Heart
EVs: 248 HP / 8 SpA / 252 SpD
Sassy Nature
IVs: 29 Spe
- Fleur Cannon
- Iron Head
- Hidden Power [Fire]
- Volt Switch

Landorus-Therian @ Leftovers
Ability: Intimidate
EVs: 252 HP / 236 Def / 20 Spe
Impish Nature
- Earthquake
- Stealth Rock
- U-turn
- Hidden Power [Ice]

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 64 Def / 192 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Volt Switch
- Will-O-Wisp
- Pain Split