Your team is lacking any offense against Water-type Pokemon. You should probably consider putting a Grass- or Electric-type into your party. I can't access any of my sources right now, so I can't come up with a move list as of right now... but I can put one down as soon as I get home.
He already has Ferrothorn. But that one lacks Grass moves whatsoever
Curse Ferrothorn requires a lot of support to be effective. Ferrothorn is better off as a hazard setter, and Thunder Wave and Gyro Ball don't go well together:
-Spikes/Stealth Rock
-Leech Seed
-Power Whip/Protect
-Gyro Ball/Thunder Wave
Nature: Relaxed
EVs: 252 HP/208 Def/48 SDef
Item: Leftovers
Ability: Iron Barbs
I'd use Rapid Spin as a primary option with Excadrill if I were you. Substitute and Protect also waste away valuable Sandstorm turns when Excadrill should be attacking:
-Earthquake
-Rock Slide
-Rapid Spin
-Swords Dance/Shadow Claw
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb/Leftovers/Assault Vest
Ability: Sand Rush
While Tyranitar's Sand Stream can be extended with Smooth Rock, the passive recovery granted by Leftovers or the extra special bulk granted by Assault Vest is more useful:
-Crunch
-Pursuit
-Rock Slide/Stone Edge
-Stealth Rock/Fire Blast
Nature: Careful/Sassy
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers/Assault Vest
Ability: Sand Stream
Body Slam isn't available for Togekiss till Poke Bank. It's better off using defensive or bulky sets to make the most out of its new typing. Choice Scarf locks Togekiss into one move while it's in battle, and it's best to use Choice Scarf if the user has 4 attacks or 3 attacks + Trick:
-Nasty Plot/Thunder Wave
-Air Slash/Fire Blast
-Dazzling Gleam/Fire Blast/Flamethrower
-Roost
Nature: Calm
EVs: 248 HP/252 SDef/8 Spe
Item: Leftovers
Ability: Serene Grace
or
-Nasty Plot/Thunder Wave
-Dazzling Gleam
-Air Slash/Fire Blast
-Roost
Nature: Bold
EVs: 248 HP/252 Def/8 Spe
Item: Leftovers
Ability: Serene Grace
or
-Dazzling Gleam
-Air Slash
-Fire Blast/Aura Sphere
-Roost
Nature: Modest
EVs: 248 HP/208 SAtk/48 Spe
Item: Life Orb/Leftovers
Ability: Serene Grace
Extreme Speed and Bullet Punch are redundant with Lucario. Choose between Bullet Punch or Extreme Speed. Replace one of them with Earthquake or Crunch to let Lucario hit Aegislash, since it's walled hard by it at the moment.
Chandelure is very rarely seen at all, despite its high Special Attack. If you want to give it a shot, don't use status moves besides Trick with Choice Scarf for the reason I pointed out for Togekiss. Flash Fire is the superior ability because it gives Chandelure an extra type to switch in to:
-Fire Blast
-Shadow Ball
-Hidden Power (Fighting)
-Flamethrower/Energy Ball
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Choice Scarf
Ability: Flash Fire