Rate my Team

Question

Hello. I am not the best competitive trainer and my team may suck for some.
Therefore, I need some serious help with it. Thanks in advance :)

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Torterra @ Leftovers
Ability: Overgrow
EVs: 252 Atk / 252 HP / 4 SDef
Adamant Nature (+Atk, -SAtk)
- Wood Hammer
- Stone Edge
- Earthquake
- Synthesis

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Drapion @ Razor Claw
Ability: Sniper
EVs: 252 Atk / 252 HP / 4 SDef
Adamant Nature (+Atk, -SAtk)
- Toxic Spikes
- Night Slash
- Cross Poison
- Brick Break

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Charizard @ Charizardite Y
Ability: Solar Power
EVs: 252 Spd / 252 SAtk / 4 Atk
Hasty Nature (+Spd, -Def)
- Flamethrower
- Dragon Pulse
- Solar Beam
- Rock Slide

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Hitmontop @ Focus Sash
Ability: Technician
EVs: 240 Atk / 216 SDef / 52 HP
Careful Nature (+SDef, -SAtk)
- Bulk Up
- Pursuit
- Rapid Spin
- Low Sweep

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Rotom-Wash @ Choice Scarf
Ability: Levitate
EVs: 252 Spd / 252 SAtk / 4 SDef
Timid Nature (+Spd, -Atk)
- Thunderbolt
- Trick
- Hidden Power [Fire]
- Hydro Pump

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Bastiodon @ Leftovers
Ability: Sturdy
EVs: 252 Def / 252 HP / 4 Atk
Impish Nature (+Def, -SAtk)
- Toxic
- Iron Head
- Rest
- Sleep Talk

Comments

Charizard's set is not the greatest in my opinion. There's no need for Dragon  Pulse,  replace it with Focus Blast. I would put Air Slash instead of Rock Slide. If you want to keep a Rock-type move, then use Ancient Power.

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Wow, don't treat yourself as a noob. Everybody got his chance and you the first.

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I advise you on Rotom-Wash to use a bulkier set and spread. 216 HP / 44 Spe / 248 SpD for the EV spread.
Moves: Will-O-Wisp, Hydro Pump, Volt Switch and Pain Split. This is how I run mine and it's been doing wonders since I first used it.

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^ Except you might want to use 248 Def or something instead, to switch into Physical attackers more effectively.
I would move Bastiodon out, it has little place in OU, same with Drapion, Torterra and Hitmontop. There are better Pokemon for those roles generally. Heatran is an option over Bastiodon, as both share the Steel typing and Heatran cores well with Rotom. AV Conk serves the role of hitting hard + special tank, etc.
With Charizard-Y, I suggest you revert to the more standard Fire Blast / Solar Beam / Focus Blast / Roost or Air Slash. Fire Blast in Sun literally 2HKOs most of the tier.