The thing is that Dusknoir really does need Pain Split especially if it wants to switch out after the sub is split then some back in for another one at a later date, however the only possible thing to be replaces is Fire Punch OR Shadow Sneak both of which are pretty hard to choose between coverage wise, and replacing Focus Punch is a big no no therefore leaving no reason for sub
Edit:
I also created a somewhat special Wall/Wishpasser for UU Battles.... thats right now you dont have to choose from Hypno or Grumpig! (Kinda sorta new to UU r there other Special Walls?)
Everyone thinks Flareon is so bad because of its incredibly limited movepool, however if you are willing to take a longer observation you may just see it has the tools to do a good job as a wall despite it's crapish Defense and sub-par HP so enjoy my take at a useable Flareon which I have used to some sucess in both UU and even OU
(Requires reasonable prediction skills and a love for flaming dogs[/cats?])
@Leftovers
Flash Fire
Calm (252 Hp, 252 Sp.Def, 6 Sp.Atk/Def)
-Wish
-Protect/Toxic
-Fire Blast/Toxic
-Will-O-Wisp
Alright.... so it's pretty straight forward, Wishpasser/Special Wall(/Double Statuser?)
Bring in on a fire type attack for the boost and the safety use Will-O-Wisp on the switch or wish if planning on passing and run it from there, Fire Blast because it gets Flash Fire boost and gives it some form of attack, Toxic so you can dodge boosting those annoying Rapidash/Ninetails/OU Flash Firerers if you are so bold to put it in an OU team. Protect for healing with lefties/wish and for scouting however I also put toxic as an alternative but that limits healing, scouting and Burn/Toxic stalling capabilities.
(PS. Bring a rapid spinner?)
Edit2: Changed Fire Fang to Fire Blast and nature to calm thanks RaikouLover =D
(However for accuracy purposes Careful and Fire Fang could be preferable to some just a little thing I thought to add)