A Jolly nature is redundant with Talonflame's Gale Wings ability, as it gives priority to Brave Bird. Talonflame would rather go Adamant to give its moves more power, as it's not really strong. Acrobatics isn't worth using because you're forced to go without an item, since Flying Gem is unreleased:
-Swords Dance
-Flare Blitz
-Brave Bird
-Roost
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Life Orb/Sharp Beak/Sky Plate
Ability: Gale Wings
or
-Flare Blitz
-Brave Bird
-U-turn
-Tailwind/Roost
Nature: Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Choice Band/Sharp Beak/Sky Plate
Ability: Gale Wings
or
-Bulk Up
-Brave Bird
-Roost
-Taunt/Will-o-Wisp
Nature: Careful
EVs: 248 HP/8 Def/252 SDef
Item: Leftovers
Ability: Gale Wings
Mega Gardevoir has base 100 Speed, which is rather fast, though it's not the best Speed tier to have. Having more Speed is more important than bulk for Gardevoir, as it's still physically defensively weak:
-Psyshock
-Hyper Voice
-Focus Blast
-Taunt/Will-o-Wisp/Shadow Ball/Calm Mind
Nature: Timid/Modest
EVs: 24 Def/232 SAtk/252 Spe
Item: Gardevoirite
Ability: Trace
As tempting as Swords Dance + King's Shield Aegislash is, it's terrible. I've said this many times in other threads, and I'll say it again for emphasis: this Aegislash variant is easily walled and rendered useless by burn. As a result, you're better off either a mixed or specially based Aegislash or forgo King's Shield entirely if you stick to Swords Dance for whatever reason:
Shadow Ball
-Shadow Sneak/Sacred Sword
-Iron Head/Sacred Sword/Pursuit
-King's Shield
Nature: Quiet
EVs: 244 HP/12 Def/252 SAtk
Item: Leftovers/Spooky Plate/Spell Tag/Air Balloon
or
-Substitute
-Toxic
-Shadow Ball
-King's Shield
Nature: Modest
EVs: 244 HP/12 Def/252 SAtk
Item: Leftovers
or
-Shadow Ball
-Shadow Sneak
-Flash Cannon/Pursuit
-Sacred Sword
Nature: Hasty/Naive
EVs: 4 Atk/252 SAtk/252 Spe
Item: Life Orb
or
-Swords Dance
-Shadow Sneak
-Shadow Claw/Iron Head
-Sacred Sword/Head Smash
Nature: Adamant
EVs: 252 Atk/4 SDef/252 Spe
Item: Life Orb
Stone Edge is a detriment for a defensive Pokemon like Gliscor, due to its low PP. If it gets PP stalled out, that's a bad thing if your other offensive move is Earthquake, which can be switched into relatively easily (Levitate, Flying, resists). This is how Gliscor should look like:
-Earthquake
-Substitute/Knock Off
-Toxic
-Protect
Nature: Impish
EVs: 244 HP/100 Def/160 Spe
Item: Toxic Orb
Ability: Poison Heal
Belly Drum Azumarill needs some form of Speed investment. 92 HP/252 Atk/164 Spe allows Azumarill to outspeed Pokemon with minimum base 70 or less (i.e. Scizor, Aegislash).
Milotic has to go. It's outclassed by other bulky Water Pokemon like Wash Rotom, Gastrodon and Quagsire. If you have a tough time with Mega Kangaskhan, you could use a Ghost like Gengar to get around its Sucker Punch shenanigans with Destiny Bond. Talonflame handles Ferrothorn somewhat nicely, though it will take some nasty recoil in the process. Mega Gardevoir's Pixilated Hyper Voices does boatloads to Wash Rotom; it can also use Taunt to shut down any attempts to status or recover;:
Anyway, Gengar sets for you:
-Substitute
-Shadow Ball
-Will-o-Wisp
-Disable/Taunt/Sludge Wave/Sludge Bomb/Focus Blast
Nature: Timid
EVs: 28 HP/148 SAtk/80 SDef/252 Spe
Item: Black Sludge
or
-Shadow Ball
-Sludge Bomb/Sludge Wave
-Focus Blast/Thunderbolt
-Destiny Bond
Nature: Timid
EVs: 4 HP/252 SAtk/252 Spe
Item: Life Orb/Focus Sash