Absol is a good Pokemon, especially ingame in which its forgetable speed isn't much of a problem and its movepool and ATtack stat is a great asset. Torkoal should be removed for Absol if you decide to add it in.
For a moveset, since this is Gen 3, you'll want:
Ice Beam: Always a useful move ingame, and it works well even with an average Special Attack. The main point of this is to easiy beat Drake of the Elite 4, Ice Beam devestates his team, most of which has a x4 weakness to it.
Thunderbolt: Thunderbolt is also for the elite 4, this time for help against Wallace.
Shadow Ball: This is Physical in Gen 3. It also deals with Phoebe of the Elite 4.
Return: High power.
It's unfortunate that Absol doesn't have the Physical-Special split in Gen 3.