Why not put Knock off on a Scout like Meinshao? Seems like a great idea, plus it puts a great deal of fear around your scout.
"This is why you can't have nice things!"
Meinshao @ Left Overs
Jolly, Regenerator
EVs: 252 Spe / 252 HP / 4 Att
- Knock Off
- Fake Out
- U-Turn
- Drain Punch / High Jump Kick / Toxic / Acrobatics*
Knock Off seems great as part of a hit and run strategy, plus it gives it a bit of coverage (not GREAT coverage, but it can hit Ghosts). Fake Out is sort of one of Meinshao's things that it does, and it does a bit of hurt at no cost in 1v1. U-Turn for momentum, to help trigger that regenerator, and because it's always a fun move.
That last slot can go to Drain Punch or High Jump Kick if you want to keep him out for damage or as a safe fall back if he outlives your team (Knock off and Fake out don't really finish battles...), and I thought toxic on a scout might not be a bad idea because you really can't go wrong poisoning everything you can.
The idea behind this guy is to outspeed just about everything it can, Fake Out, Knock Off, and U-Turn into something else, heal w/ Regenerator, and do it again later. Nothing is Immune to Knock Off and U-Turn, so there's no easy way out, and Ghosts are Immune to Fake Out but weak to Knock Off, so if they try a "smart" switch, you can troll them pretty well.
Also, if you want to put Left Overs on something else, you could try Assault Vest for some more bulk (Take Drain Punch or maybe HJKick), or a consumable item like a Berry or a Red Card (For multiple Knock Offs in a row) and grab Acrobatics*, or maybe even put some safety goggles on him (For anti-weather/spore).
This would go well on a team that has some good defensive pivot switches, and would like a Rapid Spin. Plus, the only true threat to this guy would be Megas (don't drop items) and Paralysis, as it would make him very difficult/impossible to use. The only downside, is after the first Knock Off combo, they know what to look for, and will be ready for it the next time, but any good player could use this to their advantage.