Acrobatics doubles your speed into the 500s, easily outspeeding the entire unboosted tier. Stone Edge is nice STAB but has risky accuracy. Rock Slide is a more safe option with a welcome chance to flinch your opponent. Heat Wave greatly assists your coverage and although it can miss, Archeops doesn't get Flamethrower. Dragon Pulse deals with the ever-present Druddigon while also giving it great neutral coverage. Focus Blast deals with Rock types that would otherwise cripple. Earthquake has perfect accuracy and deals with three of Archeop's weaknesses, also granting it the sacred EdgeQuake combo.
...Color me confused, but Archeops does not get Unburden.
One of the writers for the PotW, and apparently the keeper of sanity and order.
I make no claim of being perfect or always right. Take everything I say with a grain of salt.