I'm not a big fan of Hex because it isn't a good move competitively, since it relies on the opponent being statused; otherwise it's very weak. (65 base power isn't anything special)
Sableye should use Will-o-Wisp as its status move. Thunder Wave isn't worth bothering, and it's not worth giving up the utility of Taunt for. Keep your current EV spread; splitting defensive EVs isn't worth it.
Cohagrigus is best played as a Trick Room attacker:
-Trick Room
-Nasty Plot
-Shadow Ball
-Hidden Power (Fighting)/Will-o-Wisp
Nature: Quiet
EVs: 252 HP/4 Def/252 SAtk
Item: Leftovers
Dusclops is very weak offensively and must rely on Night Shade or Seismic Toss for consistent damage. It's not worth putting Hex on, heck, I don't think it isn't worth putting on the team.
You're seriously wasting away Spiritomb's trapping utilities for the sake of Hex? That's not worth it; Spiritomb can't even learn Hex at all:
-Sucker Punch
-Pursuit
-Shadow Sneak
-Trick/Will-o-Wisp
Nature: Adamant
EVs: 248 HP/252 Atk/8 SDef
Item: Choice Band/Black Glasses/Dread Plate
Fire Blast > Heat Wave (or Flamethrower) on Chandelure. The extra power is definitely welcomed and 85 accuracy is acceptable.
I appreciate this is a bit of gimmick/not very competitive team, I just like to have a bit of fun with it sometimes and see how it goes.
My only concern about removing T-wave from sableye is that I've noticed more fire mons hanging around at the moment (zard and its megas, T-flame, blaziken (on wifi) etc), which I obviously cannot burn. But yeah missing taunt is bad, guess I'll go with taunt on it. Especially if as discussed below Dusclops goes out for Jellicent?
I'll probably leave Cohagrigus as is for now and just try it out.
As for dusclops, I had put night shade and not hex, but I appreciate the point. Visually I dislike it the most but I thought since this is a bit of a defensive team designed to spread status around, it had its place. What would you suggest replacing it with? I don't want to use Rotom as it loses its type in any form. I was thinking of maybe..
Trevenant or Jellicent? If I wanted something else bulky to fill a similar role to Dusclops.
Jellicent might be an idea, with say...
Nature: Calm
EV's: 252 HP, 220 sp.def, 36 def
Item: ??? Hell maybe a weakness policy haha.
Scald/Water spout
Toxic
Recover
Shadow ball/hex
As for Spiritomb I wasn't aware it couldn't learn it tbh but I see your point. I'll give your suggested set a go.
Chandelure wise, since fire blast is down to 110, is the 15bp worth the 5% drop? I know 5% isn't a lot but...sometimes it's the difference.