Okay, so I made it to 1400 with my team, but I think this is as far as I'll get with it. I'll just post it here in case someone can improve upon it.
		
		
	
	 
Weavile (Tsareena) @ Wide Lens 
Ability: Queenly Majesty 
EVs: 252 Atk / 4 Def / 252 Spe 
Jolly Nature 
- Triple Axel 
- Knock Off 
- U-turn 
- Power Whip
My Triage counter and general physical hitter. Wide Lens for reliably hitting Triple Axels. Moveset is standard except for Power Whip in place of High Jump Kick, which I initially tried but found underwhelming (plus there are a bunch of Ghost types running around). Power Whip hits Rhyperior, Keldeo, Urshifu-Rapid, Primarina, etc. harder than your other moves.
 
Toxapex (Emolga) @ Leftovers  
Ability: Motor Drive  
EVs: 252 HP / 4 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- U-turn  
- Roost  
- Defog  
- Nuzzle
My usual lead (or anti-lead, I guess?). It spreads Paralysis and Defogs entry hazards. 0 Speed IVs and Relaxed nature so it gets off a slow U-Turn even with Paralysis' speed drop/Motor Drive's speed boost.
 
Cobalion (Orbeetle) @ Leftovers 
Ability: Frisk 
EVs: 252 HP / 4 Atk / 252 Def 
Impish Nature 
- Sticky Web 
- U-turn 
- Iron Defense 
- Body Press
After 1 Iron Defense, this thing takes even super-effective hits surprisingly well. Sticky Web is there to slow down mons that my Toxapex can't Paralyze (notably Zeraora and Jolteon). U-Turn to gain momentum vs Ghost types that come in expecting Body Press, the latter of which is very strong as mentioned earlier in this thread.
 
Chandelure (Mawile) @ Life Orb  
Ability: Sheer Force  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Flamethrower  
- Shadow Ball  
- Focus Blast  
- Substitute 
Pretty straight-forward wallbreaker set. The three attacks have perfect neutral coverage, so I gave it Substitute to deal with status users and to ease prediction. I'm on the fence about switching to Timid, just so I can guarantee outspeeding Zeraora with webs on the opponent's side.
 
Mandibuzz (Wooper) @ Heavy-Duty Boots  
Ability: Unaware  
EVs: 252 HP / 24 Def / 232 SpD  
Impish Nature  
IVs: 0 Atk  
- Haze  
- Recover  
- Toxic  
- Encore
My answer to set-up mons. Encore-lock them, Haze them, Toxic stall them, whatever it takes to not immediately lose to a Quiver Dancing Gengar or an Unburden+Swords Dance Gyarados. EV spread and Nature are just to have equal defenses.
Zeraora (Conkeldurr) @ Flame Orb  
Ability: Guts  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Bulk Up  
- Thunder Punch  
- Close Combat  
- Knock Off
I think this is the next best thing to the Mawile-donor set (which I can't run due to donor clause) in terms of immediate power.