Zoroark-Typically, when up against a Spiritomb, people will likely lay a status on him or use their strongest STAB move. Zoroark would go down pretty quickly in this situation, so rather than worry about that, I would suggest giving him a focus sash, since a wide lens isn't really worth risking it if it only benefits one move. Night daze benefits from it, but 95% accuracy is high enough that you don't need the item for help. Also, why not go with hidden power [flying], that way you can not only hit bug types (covering both his weaknesses at once) but you don't have to worry about dark types coming in on immunity. If you're gonna do HP Psychic, you might as well use extrasensory, since it's stronger and has a chance to flinch.
Scrafty-I would consider using Substitute and Drain punch while going for a moxie sweep. It would help him build up power, all while remaining safe behind his sub.
Drapion-Your team doesn't have much going in terms of support or defense. Umbreon would make a good teammate somewhere in here, but if not, consider toxic spikes with this guy. The poison damage could prove to help you out later.
Hydreigon-I would consider running a speed nature, that way you can outrun some essential pokemon. I would also go with dark pulse over HP Dark.
Absol-Get rid of Shadow claw. Ghost covers ghost and psychic, and so does dark, but you get STAB with a dark move. You could go with Megahorn, Sucker Punch (though two STAB dark moves isn't that great, priority is essential for him), swords dance to boost up his attack power, or the odd thunder wave to help with his speed.
Spiritomb-While he gets STAB with both, you don't need shadow ball and dark pulse since they cover the same pokemon. Consider pain split and turn him into a more defensive pokemon; you've got plenty of sweepers already. A status move like Will-O-Wisp would do fine, and I would also suggest using leftovers instead of trick+black sludge, especially if you plan on using the toxic spikes drapion like I suggested.