After dibbling around in Smogon for a while, I have come up with this: Superpower is a staple move for any Absol. However, seeing as you have no access to it, the better choice would probably be Psycho Cut. Aerial Ace gives more coverage, however it doesn't have the power (or handy crit chance) that Psycho Cut has. The suggested moveset would be:
- Sucker Punch
- Psycho Cut
- Perish Song/Stone Edge/Play Rough/Superpower
If you choose Stone Edge for the final moveslot, the set is resisted by 11 Pokémon. If you choos Play Rough (egg move, may be difficult to get), the set is resisted by 3 Pokémon. If you are able to get Superpower, the set is resisted by NO Pokémon. Perish Song forces switches, but it's risky.
Hope you have some Super Luck with your Absol! (see what I did there?)