Giving sets for each Pokemon would be appreciated here.
Before you even think about Swords Dance + King's Shield Aegislash, don't use it. It's crippled by burn easily. Instead, look at these options:
-Shadow Ball
-Shadow Sneak/Iron Head
-Sacred Sword/Iron Head/Pursuit
Nature: Quiet
EVs: 244 HP/12 Def/252 SAtk
Item: Leftovers
or
-Substitute
-Toxic
-King's Shield
-Shadow Ball
Nature: Modest
EVs: 244 HP/12 Def/252 SAtk
Item: Leftovers
or
-Shadow Ball
-Flash Cannon/Pursuit
-Shadow Sneak
-Sacred Sword
Nature: Hasty/Naive
EVs: 4 Atk/252 SAtk/252 Spe
Item: Life Orb
or
-Swords Dance
-Shadow Sneak
-Iron Head/Shadow Claw
-Sacred Sword/Head Smash
Nature: Adamant
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb
I'm pretty sure you know what the gist of Volcarona is:
-Quiver Dance
-Fire Blast/Fiery Dance
-Bug Buzz
-Giga Drain/Roost
Nature: Modest
EVs: 136 HP/252 SAtk/120 Spe
Item: Life Orb
Ability: Flame Body
Breloom is used more than Roserade because of its utility in Spore and being a better use of Technician:
-Bullet Seed
-Mach Punch
-Rock Tomb
-Spore
Nature: Adamant/Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Focus Sash
Ability: Technician
But if you insist on using Roserade:
-Spikes
-Leaf Storm
-Hidden Power (Fire)
-Sleep Powder
Nature: Timid
EVs: 4 Def/252 SAtk/252 Spe
Item: Life Orb
Ability: Technician
Greninja:
-Hydro Pump
-Ice Beam
-Extrasensory
-Dark Pulse/Hidden Power (Fire/Grass)/Grass Knot/Spikes
Nature: Timid
EVs: 252 SAtk/4 SDef/252 Spe
Item: Life Orb/Focus Sash
Ability: Protean
Since Volcarona is weak to Stealth Rock, Togekiss should take up a hazard-clearing role with Defog:
-Thunder Wave
-Air Slash
-Roost
-Defog
Nature: Calm/Bold
EVs: 248 HP/8 Def/252 SDef (Calm) or 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Serene Grace
To let you know ahead of time, Mega Garchomp is only good on sand teams; without sand support, Sand Force is useless. The lowered Speed doesn't help, either:
-Swords Dance
-Outrage/Dragon Claw
-Earthquake
-Stone Edge/Fire Fang
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Lum Berry
or
-Outrage
-Earthquake
-Rock Slide/Stone Edge
-Dragon Claw/Fire Blast
Nature: Jolly/Naive
EVs: 4 HP/252 Atk/252 Spe
Item: Choice Scarf
or
-Stealth Rock
-Outrage/Dragon Claw
-Earthquake
-Fire Blast/Swords Dance
Nature: Naive/Jolly
EVs: 252 Atk/4 SAtk/252 Spe
Item: Focus Sash/Rocky Helmet/Lum Berry
or
-Stealth Rock
-Dragon Tail
-Earthquake
-Toxic/Fire Blast
Nature: Impish
EVs: 252 HP/252 Def/4 SDef
Item: Rocky Helmet
Ability: Rough Skin