Greninja gained Gunk Shot and Low Kick in OR/AS, making it more dangerous against OU in general. In X/Y, Greninja lacked a way to reliably get past healthy Fairy Pokemon, and Gunk Shot changed that in OR/AS. Low Kick also gives Greninja a way to hit Tyranitar and Heatran more reliably than Hydro Pump, but it's not entirely necessary:
-Hydro Pump/Low Kick
-Ice Beam
-Gunk Shot
-Dark Pulse/Hidden Power (Fire)/Grass Knot
Nature: Naive
EVs: 40 Atk/216 SAtk/252 Spe
Item: Life Orb
Ability: Protean
Aegislash is an Uber Pokemon; it can't be used in standard teams. Considering that Mega Garchomp is mediocre outside of sand teams (which yours isn't), you're better off using regular Garchomp and giving the Mega slot to Metagross:
-Meteor Mash
-Zen Headbutt
-Earthquake/Hammer Arm
-Bullet Punch/Ice Punch/Grass Knot
Nature: Jolly/Adamant
EVs: 252 Atk/4 Def/252 Spe
Item: Metagrossite
Ability: Clear Body
or
-Agility
-Meteor Mash
-Zen Headbutt
-Earthquake/Hammer Arm
Nature: Adamant
EVs: 80 HP/252 Atk/176 Spe
Item: Metagrossite
Ability: Clear Body
Hawlucha is better off using SubSitrus as a way to activate Unburden. Acrobatics should be its Flying STAB, as it's stronger when the user has no item. Swords Dance is also preferred over Hone Claws, as it boosts Attack faster:
-Substitute
-Swords Dance
-High Jump Kick
-Acrobatics
Nature: Jolly
EVs: 12 HP/252 Atk/244 Spe
Item: Sitrus Berry
Ability: Unburden
As I mentioned before, regular Garchomp is better over Mega Garchomp; this is the rare time when the regular Pokemon is better than the Mega. Why? Because Garchomp loses Speed when it Mega Evolves, and 92 Speed leaves it outsped by other 100+ Speed Pokemon, like the Mega Charizards:
-Stealth Rock
-Outrage/Dragon Claw
-Earthquake
-Swords Dance/Fire Blast
Nature: Jolly/Naive
EVs: 4 HP/252 Atk/252 Spe
Item: Focus Sash/Lum Berry/Rocky Helmet
or
-Swords Dance
-Outrage/Dragon Claw
-Earthquake
-Stone Edge/Fire Fang/Substitute
Nature: Jolly
EVs: 4 HP/252 Atk/252 Spe
Item: Life Orb/Lum Berry
or
-Outrage
-Earthquake
-Stone Edge/Rock Slide
-Dragon Claw/Fire Blast
Nature: Jolly/Naive
EVs: 4 HP/252 SAtk/252 Spe
Item: Choice Scarf
I don't know what to do with the last 2 slots, tbh.