Hi d-idara, nice team overall, I hope you're playing this on wi-fi or somewhere where Blaziken it's not banned!
Also I see you're using different items, that means that you're playing in a tourney or something with item clause?
Ok, Blaziken is broken. If you manage to get some boosts, you can almost clean sweep any team, so I don't see major threats...
Try to use a SD Set
Blaziken @ Wide Lens | Speed Bost
Adamant | 252 Atk / 4 Def / 252 Spe
Sword Dance / High Jump Kick / Blaze Kick / Stone Edge
After a Sword Dance Blaziken becomes very powerful, however, it's still frail, and it need screen support, I've never used Musharna but I think it's outclassed by Reuniclus and Deoxys-S, so I suggest you should try this Deoxys-S set, since it's pretty fast and can set up screens:
Deoxys-S @ Light Clay | Pressure
Jolly | 252 HP / 4 Def / 252 Spe
Light Screen / Reflect / Taunt / Stealth Rocks
In a land where Blaziken is not banned, Garchomp isn't banned neither, and he's very annoying in sandstorm, and can destroy your team with subs or sword dances, but Outrage doesn't 2OHKO (if my calcs are right) Scrafty, that lets you set up Dragon Dances and then Ice Punch.
If you're using Moxie and HJK on Scrafty, give him Leftovers. Also, you should use a Choice Scarf set on Hydreigon for revenge killing: Modest or Timid nature, Draco Meteor, Surf or Focus Blast, Dark Pulse and Fire Blast, with Choice Scarf.
Your team struggles against Dark/Fighting coverage, but I guess Blaziken can solve that problem, or you can use Skarmory > Ferro.
I don't see that Chandelure has an important role on your team, and you need another wall imo, a spinblocker, Jellicent!
Jellicent has taunt for slow walls like Blissey and Ferro, and he can burn physicall sweepers
Jellicent @ Leftovers | Water Absorb
Bold | 248 HP / 216 Def / 44 Spe
Scald / Recover / Will-o-Wisp or Toxic / Taunt
Anyways good luck with your team, sorry if suggestions are bad,