Well, depends on what you're using Aron for, I suppose. Like DT said, it makes a good lead with Stealth Rock and Sandstorm. It's powerful Head Smash attack would seal away rapin spinners like Pineco and Squirtle, like it's nobody's business.
This moveset makes for a good Physical sweeper though, but Sandstorm just opens up an opprotunity for your opponent to land a hit on you. Also like DT said, for this kind of moveset, I'd add in Aerial Ace to deal with Belly Drum Makuhita and Swords Dance Riolu.
EDIT: Dragon Rush would also work, to wall and deal with Extremespeed Dratini. Rock Polish may also help with Aron's Speed, roughly reaching a Speed of 17 after only one Rock Polish, with a neutral nature. Curse helps with Physical tanking.
You could even pack Metal Sound, Flash Cannon, Shock Wave / Water Pulse, and Ancientpower, to attempt a confusing Physical Wall / Special sweeper build.