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>60 SpA Pelipper Surf vs. 252 HP / 252 SpD Solrock: 186-222 (54 - 64.5%) -- guaranteed 2HKO after Leftovers recovery
>60 SpA Pelipper Surf vs. 252 HP / 252 SpD Lunatone: 162-192 (47 - 55.8%) -- 74.2% chance to 2HKO
There's no way that they're that specially invested, and solrock's an easy OHKO uninvested.
>Neutral nature, mixed-stats pelipper is enough to solo
Granted, there's CM and light screen, but they can't hit SE and you have another pokemon on the side to finish them off. Surf really is all you need.