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Skarmory's physical move pool is shallow, so I don't really see a use of offensive sets. But then again, offensive Skarmory has surprised me a fair few times in the Battle Subway and Battle Frontier (heck, there's even a Choice Scarf variant).
Just for the record, your Pokemon should be able to switch into all of the foe's moves, not just one. Wifi Clause/Team Preview is in effect in all Gen 5/Gen 6 tiers so the other player will know your team beforehand. If they're good at battling, they'll be careful not to make the mistake of using Earthquake on Jolteon as they'll know that you have a Flying type on your team. They might predict a switch to Pelipper and use Rock Slide. :P