Absol @ Razor Claw
Adamant: 252 Attack/252 Speed/6 Defense
Super Luck
-Swords Dance
-Psycho Cut/Slash
-Night Slash
-Double Team

This absol is one of a kind, it abuses critical hits. With a combo of Super luck, Razor Claw, and a Night Slash, or any high crit hit move, you have about a 33% chance of a Critical hit. First, you use Double Team about 3-4 times. Then you Sword Dance one or two times, after that you just attack away. WARNING, this is NOT intended for sweepers,it would probably get KOed against a Garchomp,use it only against walls and stallers you can't get around, so you should show them your critical hit rage. But if get around that wall or sweeper, you should basically use it until it goes down. I've got a 4 pokemon sweep this way. But it has one
more use, a Alakazam/Gengar stopper. All you have to do is switch when you think they are going to use a Ghost/Dark/Psychic move, then next turn (If they don't have anything like Thunderbolt or Energy Ball, you should survive) just counter with a Night Slash. And one more thing, if you're going to use this, it defies Double Team clauses, so if you plan to battle with the clause, I recommend you switch Double Team with Sucker Punch.

Drop Razor Claw for Scope Lens and DT is banned in the standard metagame. Why don't you use Slash, Night Slash and Psycho Cut at the same time? Or you can use Sucker Punch, since Absol is slow.

DT is generally banned from competitave play.

Also, Scope Lens is a better item for this set than Razor Claw. IIRC, with Scope Lens, Super Luck and a high crit move you have about a 40% chance of getting a critical hit.

So I should Drop Razor claw for Scope Lens, and change the moveset to this?

-Swords Dance
-Night Slash/Sucker Punch
-Psycho Cut
-Slash