Ferrothorn should be used for walling purposes only. It has little to no room for setting up Swords Dance and it really likes having its support options handy:
-Stealth Rock
-Leech Seed
-Gyro Ball/Thunder Wave
-Power Whip/Protect
Nature: Relaxed
EVs: 252 HP/88 Def/168 SDef
Item: Leftovers/Shed Shell
Ability: Iron Barbs
You appear to have a pretty bad weakness to Bisharp, as half the team is comprised of Ghosts. Bisharp can Knock Off Doublade's Eviolite and slam Chandelure and Gengar hard with Sucker Punch. Doublade functions best on stall teams to handle Mega Gardevoir and Mega Heracross better. For these reasons, I'd remove Chandelure and Doublade and replace them with Mandibuzz (to provide Defog support for your Stealth Rock-weak Pokemon), Azumarill (for a better check against Dark Pokemon) or Therian Landorus (for a good check against physically-oriented targets):
Mandibuzz:
-Foul Play
-Roost
-Taunt/Whirlwind
-Defog
Nature: Bold
EVs: 248 HP/136 Def/108 SDef/16 Spe
Item: Leftovers
Ability: Overcoat
Azumarill:
-Waterfall
-Play Rough
-Aqua Jet
-Knock Off/Superpower
Nature: Adamant
EVs: 164 HP/252 Atk/92 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
Therian Landorus
-Earthquake
-Stone Edge
-U-turn
-Knock Off/Superpower/Explosion
Nature: Jolly
EVs: 252 Atk/24 Def/232 Spe
Item: Choice Scarf
or
-Stealth Rock
-Earthquake
-U-turn
-Stone Edge/Rock Slide/Knock Off
Nature: Impish
EVs: 252 HP/248 Def/8 Spe
Item: Leftovers
or
-Swords Dance
-Rock Polish
-Earthquake
-Stone Edge
Nature: Adamant
EVs: 56 HP/252 Atk/200 Spe
Item: Leftovers
While Mega Aerodactyl's bulk is rather decent, its common weaknesses can pose problems for using setup moves. It's better off all-out attacking:
-Stone Edge
-Aerial Ace
-Fire Fang/Earthquake
-Aqua Tail/Ice Fang
Nature: Jolly
EVs: 248 Atk/44 Def/216 Spe
Item: Aerodactylite
Take note that King's Rock doesn't stack with flinch moves, so Togekiss should use Leftovers:
-Thunder Wave
-Air Slash
-Defog/Heal Bell/Dazzling Gleam/Aura Sphere/Flamethrower
-Roost
Nature: Calm/Bold
EVs: 248 HP/8 Def/252 SDef (Calm) or 248 HP/252 Def/8 SDef (Bold)
Item: Leftovers
Ability: Serene Grace
Thanks a million, I owe you one!
"Nobody dies but many regret."-Armswield.