Rate my best (so far) ou team

Question

Cinderace @ Heavy-Duty Boots
Ability: Libero
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Pyro Ball
- U-turn
- High Jump Kick
- Sucker Punch

Swampert @ Leftovers
Ability: Damp
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Stealth Rock
- Flip Turn
- Earthquake
- Toxic

Corviknight @ Leftovers
Ability: Pressure
EVs: 252 HP / 168 Def / 88 SpD
Relaxed Nature
- Defog
- Roost
- U-turn
- Brave Bird

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature
IVs: 0 Spe
- Spikes
- Body Press
- Leech Seed
- Gyro Ball

Nidoking (M) @ Life Orb
Ability: Sheer Force
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sludge Wave
- Earth Power
- Flamethrower
- Ice Beam

Hydreigon @ Choice Scarf
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
- Draco Meteor
- U-turn
- Dark Pulse
- Earth Power

I mostly used smogon sets but they work fine. Cinderace is pretty self explaitory. I opted for hjk over gunk because nidoking does an amazing job at breaking fairies. Sucker is for spectrier, I maybe replace that with gunk or zen headbutt if ghost horsey gets banned. Pert has rocks and can also use toxic, and the min speed is for slower flip turns. Corvi is the defogger. I may want Body Press over u Turn, but its nice for now. Ferrothorn is doing Ferrothorn things, and Body Press does damage against ttar and other ferrothorns. Nidoking is nidoking, pretty self explaitory there. Hydreigon is a Scarf, earth Power for heatran, stabs, and u Turn for going out.

Main things:
Do i really need -speed on swampert? It was what smogon had but im still not entirely sure.
Impish or Relaxed for corvi? Same thing as above
Modest or Timid for nidoking?
Finally, i had a spread for hydreigon that let it take a u Turn from Life Orb cinderace at full HP. Should I use that one or the one I have right now
And of course any other things
Thabk you
(Also sorry about the weird capitalizaton my phone auto corrects weird things)

Comments

Power Whip > Body Press because of typing.

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Youd be suprised how much ttar and other ferrothorn like coming in on it lol
It Also provides bettee coverage with gyro ball since I dont get insta walled by another ferrothorn
Also i get whip misses a lot :P

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I suggest going for thunder wave or knock off on Ferrothorn. Along with Toxapex, this pokemon is literally hell to switch into. It's probably the single most annoying pokemon in the game as of this moment

Yes, you do need minimum speed on Swampert. Your switch move loses about half its value if you switch out first as now the opponent is the one reading your move and not the other way around. The same goes for Corvinight

I suggest timid on Nidoking. Honestly, I think modest is only good if you have a sub up

No. If Hydreigon is scarfed, you do not want it to take any hits unless absolutely necessary. To be honest, I'm not even sure if scarf Hydreigon is a good pick in ou since its lease in the tier is completely tied to shutting down ghost horse and not to mention being locked into its stabs means a happy Magearna

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Ok ill try that out on ferrothorn

Should i put 0 ivs in speed on corvi than?

I think ill keep hydregon for now but do you have any suggestions on other scarfers I could use in that slot?

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If you wanna try the suggestions get rid of gyro ball. It doesn't do anything significant

Yes also on Swampert

To be honest I don't think choice scarfers are that good atm. You're probably better off using actual sweepers like Volcarona or Garchomp