Eh Scrafty barely works in OU with all the powerful special attacks flying around, I don't see any reason for it to do better in Ubers. Also fat chance of Blissey/Chansey staying in on STAB physical Fighting-type moves...
But onto my mon:
Genesect @ Choice Scarf
EVs: 138 HP / 252 Atk / 120 Spe
Lonely Nature (+Atk, -Def)
- Explosion / Shadow Claw
- Ice Beam
This is the Genesect set I've been using. A bit unconventional perhaps, but I like it. Trickroom is to credit for the moveset but I changed his EV spread !_!. Honestly if you use Genesect like me, you will rarely be using anything but U-turn. Sure this set loses the ability to revenge kill DD Rayquaza, but in return for this one thing not checked it gains a lot of power and a bit of bulk. For those curious that is enough speed to outspeed max Speed Mewtwo. I almost never use Thunder and Ice Beam, they are just extremely unreliable moves to be locked into and extremely easy to punish. U-turn hits like a truck as Genesect often finds itself with +1 Attack. Believe it or not, Explosion probably sees more use than Ice Beam and Thunder. It's sole use is basically creating a dent (~60%ish) in Extremekiller, but it in conjunction with some hazards it has saved my butt multiple times. The real beauty of Genesect is a lot of the times entry hazards are the sole way the opponent can do damage to it due to its blazing Speed and high-powered U-turn. Shadow Claw can be used for Ghostceus but even at +1 it does only 45.9% - 54.1% so you gotta hit around mid roll twice to 2HKO. Still, you can basically choose Genesect to be an emergency check to either Extremekiller or Ghostceus, two of the most dangerous sweepers in the game, with that moveslot.