I think Flygon is a better alternative over Empoleon as a Defogger because it has access to reliable recovery in Roost. Empoleon should stick to being a special attacker (using Scald as the Water move over Waterfall) simply because of its higher Special Attack. You're not using Knock Off for the damage in this case, but for the utility it provides:
Flygon:
-Earthquake
-U-turn
-Defog
-Roost
Nature: Jolly
EVs: 252 HP/16 Atk/104 Def/136 Spe
Item: Leftovers
Empoleon should stick to something like this. Leave the Knock Off support to something else, as it has no room for it:
-Stealth Rock
-Scald
-Roar
-Toxic/Protect/Defog
Nature: Calm
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Torrent
What's the deal with AV Chandelure? Its Special Defense may be decent, sure, but it has a lot of common weaknesses to Dark, Ghost, Ground, Water and Rock. Why are you not using Shadow Ball on Chandelure? Why did you opt for Dark Pulse, which lacks STAB, but has the exact same coverage as Shadow Ball?:
-Fire Blast
-Shadow Ball
-Hidden Power (Fighting)/Energy Ball
-Trick/Overheat
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Specs
Ability: Flash Fire
or
-Substitute
-Pain Split
-Shadow Ball
-Fire Blast
Nature: Modest
EVs: 68 HP/252 SAtk/4 SDef/184 Spe
Item: Life Orb
Ability: Flash Fire
or
-Fire Blast
-Shadow Ball
-Energy Ball
-Trick/Hidden Power (Fighting)/Memento
Nature: Timid/Modest
EVs: 252 SAtk/4 SDef/252 Spe
Item: Choice Scarf
Ability: Flash Fire
Jirachi has better coverage moves out there for Choice Scarf; it even has Trick to screw over walls:
-Iron Head
-Fire Punch/Ice Punch
-U-turn
-Trick/Healing Wish
Nature: Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Choice Scarf
Discharge sees little use on a fast, offensive Pokemon like Jolteon; the loss of power isn't worth the extra paralysis chance:
-Thunderbolt
-Volt Switch
-Hidden Power (Ice/Fire)
-Signal Beam
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Specs
Ability: Volt Absorb
Having 3 Dark moves on Absol is terribad because this leaves it exposed to Fighting Pokemon (and to a lesser extent, Fairies):
-Swords Dance
-Sucker Punch
-Knock Off/Night Slash
-Superpower/Play Rough
Nature: Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Absolite
Ability: Justified/Super Luck
Half this team is weak to Dark, so a Fairy or Fighting Pokemon are worth certain looks on the team. Examples are Florges, Aromatisse, Heracross, Mienshao, Slurpuff, Scrafty, Chesnaught and Cobalion:
Florges:
-Wish
-Protect
-Moonblast
-Aromatherapy/Toxic
Nature: Calm
EVs: 252 HP/232 Def/24 SDef
Item: Leftovers
Aromatisse:
-Wish
-Protect
-Moonblast
-Aromatherapy
Nature: Bold
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Aroma Veil
Heracross:
-Megahorn
-Close Combat
-Stone Edge
-Earthquake/Sleep Talk
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band/Choice Scarf
Ability: Guts/Moxie
or
-Swords Dance/Substitute
-Megahorn
-Close Combat
-Stone Edge
Nature: Adamant/Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Leftovers
Ability: Guts/Moxie
Mienshao:
-High Jump Kick
-Knock Off
-U-turn
-Stone Edge/Aerial Ace/Drain Punch
Nature: Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Choice Scarf/Life Orb
Ability: Reckless/Regenerator
Slurpuff:
-Belly Drum
-Play Rough
-Return
-Substitute
Nature: Jolly
EVs: 252 Atk/4 Def/252 Spe
Item: Sitrus Berry
Ability: Unburden
or
-Calm Mind
-Draining Kiss/Dazzling Gleam
-Flamethrower
-Surf/Rest
Nature: Modest
EVs: 4 HP/252 SAtk/252 Spe
Item: Sitrus Berry/Chesto Berry
Ability: Unburden
Scrafty:
-Dragon Dance
-Knock Off
-Drain Punch/High Jump Kick
-Zen Headbutt/Iron Head
Nature: Jolly
EVs: 252 Atk/4 SDef/252 Spe
Item: Leftovers/Life Orb
Ability: Moxie/Shed Skin
or
-Bulk Up
-Knock Off
-Drain Punch
-Rest
Nature: Careful
EVs: 252 HP/4 Def/252 SDef
Item: Leftovers
Ability: Shed Skin
Chesnaught:
-Spikes
-Leech Seed
-Spiky Shield/Synthesis
-Wood Hammer/Hammer Arm
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Leftovers
Ability: Bulletproof
Cobalion:
-Stealth Rock
-Volt Switch/Taunt
-Iron Head
-Close Combat
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Leftovers
or
-Swords Dance
-Iron Head
-Close Combat
-Stone Edge/Substitute
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Lum Berry/Life Orb/Leftovers
or
-Calm Mind
-Flash Cannon
-Focus Blast
-Hidden Power (Ghost)/Substitute
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Leftovers
It's up to you who to replace on the team; experiment and see what works for you.