Mamoswine @ Life Orb
Ability: Oblivious
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Stealth Rock
- Icicle Crash
- Earthquake
- Ice Shard
Since this Zera isn't CC, Mamoswine can easily come into it early-game since Volt Switch gets blocked, its Rocks set also keeps hazards off against Salamence thanks to priority and Ice + Ground STAB is as we all know, basically unresisted, so you generally don't want to let this in if you can avoid it.
252 Atk Zeraora Knock Off (97.5 BP) vs. 0 HP / 0 Def Mamoswine: 115-136 (31.8 - 37.6%) -- 91.6% chance to 3HKO
252+ Atk Mamoswine Earthquake vs. 0 HP / 0 Def Zeraora: 456-536 (143.8 - 169%) -- guaranteed OHKO
252+ Atk Mamoswine Ice Shard vs. 60 HP / 0 Def Salamence: 348-412 (100.5 - 119%) -- guaranteed OHKO
252+ Atk Mamoswine Earthquake vs. 0 HP / 0 Def Zeraora: 456-536 (143.8 - 169%) -- guaranteed OHKO
252+ Atk Mamoswine Ice Shard vs. 60 HP / 0 Def Salamence: 348-412 (100.5 - 119%) -- guaranteed OHKO