Ice Shard
Thunder Fang
U-turn
Aqua Tail
Drill Peck
Zen Headbutt
I took out the more powerful of the "coverage" moves. I am opposed particularly to the high-end Fire moves (Fire Blast and Overheat) because their base power is sufficient to deal meaningful damage to Skarmory. I agree with Objection's post (#81 in this thread) where he points out that Taunt does enough to Skarmory without needing to pound on it. Aqua Tail and Thunder Fang are weak/unreliable enough that I don't see them making it into many movesets anyway, certainly not enough to compromise any of the significant checks. Ice Shard is so weak that it is mostly relevant against the Dragons that take 4x, and I frankly don't mind CAP9 being able to make Salamence or U-turn Flygon think twice before switching in over and over.
The others are niche options that I also doubt will make it into many sets. No reason not to have them.