Rate My Gen 8 OU team

Question

My team is:

Skarmory @ Leftovers
Ability: Sturdy
Nature: Impish
EVs: 252 HP / 232 Def / 24 Spe
- Spikes
- Stealth Rock
- Toxic
- Body Press

Crawdaunt @ Heavy-Duty Boots
Ability: Adaptability
Nature: Adamant
EVs: 252 HP / 252 Atk / 4 SpD
- Aqua Jet
- Crabhammer
- Knock Off
- Swords Dance

Clefable @ Leftovers
Ability: Magic Guard
Nature: Bold
EVs: 252 HP / 200 Def / 56 SpA
- Soft-Boiled
- Moonblast
- Calm Mind
- Flamethrower

Rillaboom @ Heavy-Duty Boots
Ability: Grassy Surge
Nature: Jolly
EVs: 252 Atk / 252 Spe / 4 SpD
- Darkest Lariat
- Grassy Glide
- High Horsepower
- Swords Dance

Hydreigon @ Life Orb
Ability: Levitate
Nature: Timid
EVs: 252 SpA / 252 Spe / 4 SpD
- Dark Pulse
- Nasty Plot
- Dragon Pulse
- Flamethrower

Tapu Koko @ Pixie Plate
Ability: Electric Surge
Nature: Timid
EVs: 252 SpA / 252 Spe / 4 SpD
- Dazzling Gleam
- Discharge
- Thunderbolt
- Thunder Wave

Looking forward to the answers! :)

Comments

Pixie Plate isn't a good item, use Life Orb for extra damage output. There's no point in Discharge and Thunderbolt, replace Discharge with Volt Switch.

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First change discharge with volt switch on tapu koko.
Second, you don't need heavy duty boots on rillaboom, there are much better items to use.
On your clefable use siesmic toss instead of moonblast . Also, run t-wave instead of flamethrower and you dont need calm mind.

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here my hydreigon set for gen 8 :
Move 1   
Defog
Move 2   
Draco meteor
Move 3   
Earth Power
Move 4   
dark pulse (you also use nasty plot / roost)
this is a good set I believe as a support mon. defog for hazard removing as you don't have anti-hazard moves in your team. earth power is good coverage for my team . you can still use flamethrower though

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I find crawdaunt too frail to be worrying about HP investment, even tho it’s not that fast giving it speed rly helps to solidify its stall/ wall breaking standpoint, 252 investment without nature gets it to 209 which for its power isn’t even bad.

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I think sceptile squids suggestions are great but I completely disagree about clefable.  Setup clef is a demon set and their suggestions make the set worse for the team and I would keep it as it is.

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Clefable set is good imo