Talonflame doesn't really need 2 Flying attacks, just Brave Bird is enough. Alternative moves in place of Aerial Ace are Roost, Tailwind, and Steel Wing. Roost and Tailwind seems kinda weird on a Choice Pokemon, but the idea is to use Roost then get out, or use Tailwind just before Talonflame dies.
Mach Punch or Poison Jab would be better than Fire Punch on Conkeldurr because the other 3 moves hit basically everything Fire Punch would. Mach Punch gives it a priority move to make up for its low Speed, pick off faster but weakened threats, etc. Poison Jab gives it a good option against Fairies.
If you need something to replace your Gardevoir, there's always Azumarill or Sylveon. Personally I'd go with Azumarill because of the part-Water and the priority move.
Mach Punch is a requirement on Conkeldurr because of how slow it is:
-Drain Punch
-Mach Punch
-Knock Off/Ice Punch
-Poison Jab/Stone Edge
Nature: Adamant
EVs: 252 Atk/236 SDef/20 Spe
Item: Assault Vest
Ability: Guts
Gardevoir is only good in its Mega Evolved form. Its regular form isn't that good. Go with what Zekrom said; Azumarill is a good fit on this team:
-Waterfall
-Aqua Jet
-Play Rough
-Knock Off/Superpower
Nature: Adamant
EVs: 192 HP/252 Atk/64 Spe (Choice Band) or 240 HP/252 Atk/16 SDef (Assault Vest)
Item: Choice Band/Assault Vest
Ability: Huge Power
or
-Belly Drum
-Aqua Jet
-Play Rough
-Knock Off
Nature: Adamant
EVs: 92 HP/252 Atk/164 Spe
Item: Sitrus Berry
Ability: Huge Power
What purpose does Sableye's EVs achieve? It needs the max physical bulk to take physical hits while setting up rather than the mixed spread you're trying to use.