SM OU Please Rate My Team

[MasterSenpie]

So i made this team and i dont know if i should add anything or not or even if its good

Heracross @ Heracronite
Ability: Moxie
Shiny: Yes
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Close Combat
- Pin Missile
- Rock Blast
- Earthquake

Tapu Koko @ Electrium Z
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 1 Atk
- Thunderbolt
- Roost
- Hidden Power [Ice]
- Dazzling Gleam

Greninja @ Life Orb
Ability: Protean
Shiny: Yes
EVs: 131 Atk / 125 SpA / 252 Spe
Modest Nature
- Extrasensory
- Gunk Shot
- Hydro Pump
- Shadow Sneak

Ferrothorn @ Leftovers
Ability: Iron Barbs
Shiny: Yes
EVs: 252 HP / 48 Def / 208 SpD
Careful Nature
IVs: 0 Spe
- Stealth Rock
- Leech Seed
- Power Whip
- Gyro Ball

Heatran @ Leftovers
Ability: Flash Fire
Shiny: Yes
EVs: 248 HP / 220 SpD / 40 Spe
Calm Nature
IVs: 0 Atk
- Lava Plume
- Toxic
- Protect
- Earth Power

Kyurem-Black @ Life Orb
Ability: Teravolt
Shiny: Yes
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Ice Beam
- Fusion Bolt
- Hidden Power [Fire]
- Roost
Tell me if i should switch out a pkm or change its moves, item, Evs, Etc. I would really appreciate it thxs

 

[Gross Sweep]

Welcome to Smogon! I'm locking your RMT for the time being as the forum rules require that you provide in-depth descriptions for each Pokemon to explain their roles. Please read the rules carefully and take a look at Team Showcase to see the level of detail we require. PM me with updated descriptions and I'll be happy to unlock this.