Rate my OU team

Question

Looking for suggestions and improvements. Happy for any answer.

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Rhyperior @ Leftovers
Ability: Solid Rock
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature (+Atk, -SAtk)
- Stealth Rock
- Dragon Tail
- Earthquake
- Rest

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Roserade @ Black sludge
Ability: Poison Point
EVs: 252 SDef / 252 HP / SAtk
Calm Nature (+SDef, -Atk)
- Spikes
- Leech Seed
- Giga Drain
- Sludge Bomb

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Umbreon @ Leftovers
Ability: Synchronize
EVs: 252 HP / 252 SDef / 4Atk
Careful Nature (+SDef, -SAtk)
- Heal Bell
- Toxic
- Moonlight
- Wish

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Hitmontop @ Leftovers
Ability: Intimidate
EVs: 252 HP / 252 Atk / 4 SDef
Adamant Nature (+Atk, -SAtk)
- Close Combat
- Fake Out
- Rapid Spin
- Bullet Punch

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Slowbro @ Leftovers
Ability: Regenerator
Evs: 252 Def/ 252 HP/ 4 SAtk
Bold Nature (+Def, -Atk)
- Scald
- Slack Off
- Ice Beam
- Fire Blast

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Sharpedo @ Assault vest
Ability: Speed Boost
EVs: 252 Atk / 252 Spd / 4 SDef
Adamant Nature (+Atk, -SAtk)
- Aqua Jet
- Night Slash
- Zen Headbutt
- Waterfall

Comments

Rhyperior: Maybe put the item as Focus Sash or Chesto berry.
Umbreon: You get screwed by Taunt. Heal bell, Toxic/Wish, Protect, Foul Play
Hitmontop: You might not need BP.
Slowbro: Ice Beam<Toxic
Sharpedo: You have too many EVs. ( 252 Atk/ 252 Spd/ 252 Sp.Def?) Move set: Protect, Waterfall, Night Slash, Zen Headbutt

PS. How do you ask a question like this, and Roserade is good.

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What do you mean with how you can ask a question like this?