Saw your question in the Questions thread.
Mamoswine with 16 SpA EVs, a Naive nature, and LO can 2HKO standard Rotom-W with Freeze-Dry
16 SpA Life Orb Mamoswine Freeze Dry vs. 248 HP / 0 SpD Rotom-W: 143-172 (47.1 - 56.7%) -- 26.2% chance to 2HKO after Leftovers recovery (guaranteed 2HKO after Stealth Rock)
Mamoswine with 16 SpA EVs, a Naive nature, and LO can 2HKO standard Rotom-W with Freeze-Dry
16 SpA Life Orb Mamoswine Freeze Dry vs. 248 HP / 0 SpD Rotom-W: 143-172 (47.1 - 56.7%) -- 26.2% chance to 2HKO after Leftovers recovery (guaranteed 2HKO after Stealth Rock)