Elite Four Team

I’ve just completed victory road, and I’m a little concerned about the Elite Four - wondering if my team is any good / what I could do to improve it. Right now:

Eevee: Holding Eeveeite

Moves:
Thunderbolt
Psychic
Ice Beam
Foul Play

Stats:
213, 138, 118, 118, 131, 123

Chesnaught: Holding Focus Sash

Moves:
Grass Sack (Custom Grass Move)
Energy Ball
Bulk Up
Superpower

Stats:
258, 201, 229, 123, 160, 129

Volcarona: Holding Nothing (Need to give it something, but not sure what)

Moves:
Flamthrower
Flame Wheel
Bug Buzz
Fly

Stats:
249, 122, 131, 215, 202, 195

Garchomp: Holding Focus Band

Moves:
Crunch
Dragon Claw
Earthquake
Shadow Claw

Stats:
299, 226, 162, 156, 174, 189

Delta Roserade: Holding Blackglasses

Moves:
Moonblast
New Moon
Dark Pulse
Sludge Wave

Stats:
229, 165, 115, 236, 204, 142

Empoleon: Holding Sea Incense

Moves:
Surf
Metal Claw
Drill Peck
Bubble Beam

Stats: 247, 169, 153, 220, 192, 133

I feel like Empoleon is the weak link of this party, but I’m not sure what to replace him with. I really need something to counter fairy the most, and Empoleon is supposed to do that with Metal Claw, but since it is a physical attack it isn’t super helpful. He also isn’t resistant to fire, which is what I feel like I need a water type for in the first place, though Garchomp does pretty well in that regard.

I’m okay doing a bit of training, even EV training, but not too much. Everyone here is around level 80, and I’m planning on bringing them all up to at least 86/87 before taking on the E4, so everyone’s stats will raise a little before then.

There aren’t really any problems with Eevee.

Replace Superpower on Chesnaught with Drain Punch for more survivability and so you don’t lose you boosts. Replace Focus Sash with a type boosting item or Leftovers. Replace Custom Move Grass with Wood Hammer or Seed Bomb and replace Energy Ball with Taunt or Earthquake.

Replace Flame Wheel and Fly on Volcarona with Quiver Dance and Psychic. Good items include type boosting items, Life Orb, and Leftovers.

Replace Focus Band on Garchomp with a type boosting item, Life Orb, or Leftovers. Replace Shadow Claw and Crunch with Draco Jet and Swords Dance.

Delta Roserade is okay, Calm Mind over Sludge Wave is an option.

Replace Empoleon with something that gets Livewire. It’s a very strong move which lets you cheese a good portion of the E4. Good Pokemon which get this move include Mew, Thundurus, and Delta Gallade/Gardevoir

Sword Dance is a TM that I can only get after the Elite 4, I think. Other ideas are solid, and I like the idea of using Delta Gallade / Gardevoir (really wanted to use them anyway).

Edit: just realized that I can use the move relearner, oops.

You can buy the TM at Route 15. There is a “Sketchy Salesman” after the Cave.