Want an unpredictable Scizor set? Try using him as a physical tank.
So I noticed that every Scizor here is a sweeper, and all the sets were similar, but what if Scizor wasn't just a sweeper? What if Scizor was a physical tank? I think he could do it, and this is the set that is gonna get it done.
Scizor - Leftovers
EVs: 242 HP, 252 Def, 16 Atk
Nature: Impish (+Def, -Spatk)
Bullet Punch acts as STAB and gives him something to fight back with, priority helps. Roost is for recovery, Toxic is for putting the lives of the opponent's on a timer, and Substitute helps him out by keeping him status free and keeping thae attacks off of him for a while. Look at his stats, with that EV spread his HP will be 341, and his Defense will be 328, which is enough totank some hits if you ask me, not to mention his attack will be 300, which will be enough to dish some hits too.