Could please someone help me with my ou team ?

Question

I just feel like there's something missing, but I still can't decide on which pokemon i should add or remove, for the moment i'm thinking that i could add a special wall or someone that could replace scizor as an all-out physical attacker, i like both him and ferrothorn, but they're both too weak to fire and fighting types.
Any bit of criticism is appreciated, thank you in advance for replying :)

Ferrothorn (M) @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 48 Def / 208 SpD
Relaxed Nature
- Stealth Rock
- Toxic
- Protect
- Leech Seed

Scizor (M) @ Leftovers
Ability: Technician
Shiny: Yes
EVs: 200 HP / 56 Atk / 252 SpD
Adamant Nature
- Bullet Punch
- Pursuit
- Superpower
- Bug Bite

Greninja (M) @ Expert Belt
Ability: Protean
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Ice Beam
- Surf
- Dark Pulse
- Grass Knot

Garchomp (M) @ Choice Band
Ability: Rough Skin
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Outrage
- Fire Fang
- Earthquake
- Stone Edge

Charizard-Mega-Y @ Charizardite Y
Ability: Drought
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- SolarBeam
- Focus Blast
- Dragon Pulse
- Flamethrower

Breloom @ Focus Sash
Ability: Technician
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Mach Punch
- Spore
- Bullet Seed
- Swords Dance

Comments

Power Whip / Gyro Ball > Toxic on ferrothorn.
If for some reason you get taunted, you have a back up. It also helps you beat MGyarados, who is starting to run Substitute more often, making you complete set up bait.

Life Orb > Expert Belt on Greninja. Additionally, Hydro Pump > Surf, and Extrasensory / U-turn > Grass Knot (i dont see Rotom-W or Quagsire as a problem)
LO gives you more power, which is great when coupled with something as fast as Greninja. Hydro Pump hits slightly harder, getting more kills at around 70%, where Surf would be getting kills from 60%. Also, Extrasensory lets you beat Specs Keldeo, a very difficult mon to face in OU at the moment.

Choice Scarf > Choice Band on Garchomp
This allows you to reliably check MCharizardX after it Dragon Dances one time, as it can and will sweep you.

Roost > Dragon Pulse on MCharizardY
Roost is nice, to heal up from SR damage (since you dont have a spinner/defogger)

Rock Tomb > Swords Dance on Breloom.
This allows you to hit common switch ins like Zapdos, Lati@s, and Gengar, who wall you extremely well otherwise.