I suppose this could work. By Smogon's rules, your team wouldn't be legal because Mega Lucario, Greninja, and Blaziken are banned in Gen 6's Overused. However, I can suggest some potential improvements:
Blaziken:
Ability: Blaze -> Speed Boost
Poison Jab -> Protect
Blaze Kick -> Flare Blitz
Sky Uppercut -> High Jump Kick
Item: Many options could potentially work since Speed Boost Blaziken is self-sufficient without a mega evolution. Life Orb would be one that comes to mind.
Greninja:
Ability: Torrent -> Protean
Ice Punch -> Ice Beam
Night Slash -> Dark Pulse
Extrasensory -> Toxic Spikes/U-turn (Extrasensory can stay if you choose)
Rindo Berry -> Life Orb
Mow Rotom:
Personally, you really shouldn't be using Mow Rotom over Heat or especially Wash
Wash Rotom:
A personal moveset I like to run goes like this:
Leftovers/Life Orb
Will-o-Wisp
Volt Switch
Hex/Pain Split
Hydro Pump
Lucario:
Inner Focus -> Justified
Dragon Pulse -> Bullet Punch
Shadow Claw -> Close Combat/Meteor Mash/Mach Punch
Zoroark:
Item: Life Orb
Night Slash -> Dark Pulse/Night Daze (The latter is a dead giveaway to your illusion if you care about preserving it)
Garchomp:
Item: Leftovers/Choice Scarf
Sand Veil -> Rough Skin
Dragon Rush -> Outrage/Draco Meteor
Earth Power -> Earthquake
Anyways, that's what I'd do. If you're considering using this in Ubers, you might want to reconsider using Zoroark or Rotom in place of a box legendary.