Just ran a calc, guess what. Technician Breloom's Mach Punch can 1HKO with a Life Orb
This is a check to Darkrai if and only if Breloom is carrying a Life Orb, +Nature and Darkrai has not invested any EVs into physical bulk. Naturally, once Darkrai does go to OU, Scarf Terrakion 1hko's with Close Combat even with maxed HP and Def EVs in Darkrai.
so, essentially any 130 atk power fighting mon with a fighting attack with a base power of atleast 60 (65 to be safe) (Before stab) can easily 1hko Darkrai. Of course, hopefully, that mon doesn't be put to sleep before it can use said move.
I still don't like Darkrai being put in OU. It's a very scary mon with it's unique attack. It's ability isn't so bad really due to sleep clause but damn are it's stats rediculous.
MewtwoTHOUSAND is an original character DO NOT STEAL.
Oh and I use cheating devices to hack legitimate pokemon that I use for my own amusement only, get over it.