I could use some help with my team. In particular, I'm not too sure about the rotom slot, some of the EV spreads, and a few of the filler moves could probably use some improvement too. Also how do you think this team would perform in doubles, and what would I need to change to make it work better there?

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All feedback welcome! Thanks!

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Hydreigon @ Choice Specs

Ability: Levitate

EVs: 4 HP / 252 SpA / 252 Spe

Timid Nature

IVs: 0 Atk

- Hydro Pump

- Flash Cannon

- Draco Meteor

- Flamethrower

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Sylveon @ Pixie Plate

Ability: Pixilate

EVs: 252 HP / 252 Def / 4 SpA

IVs: 0 Atk

- Wish

- Yawn

- Hyper Voice

- Protect

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Corsola-Galar @ Eviolite

Ability: Cursed Body

EVs: 252 HP / 252 Def / 4 SpD

Bold Nature

IVs: 0 Atk

- Strength Sap

- Will-O-Wisp

- Night Shade

- Haze

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Togekiss @ Weakness Policy

Ability: Serene Grace

EVs: 236 HP / 4 Def / 28 SpA / 4 SpD / 236 Spe

Timid Nature

IVs: 0 Atk

- Air Slash

- Dazzling Gleam

- Psychic

- Fire Blast (Aura Sphere?)

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Excadrill @ Focus Sash

Ability: Mold Breaker

EVs: 4 HP / 252 Atk / 252 Spe

Jolly Nature

- Iron Head

- Earthquake

- Fissure

- Rock Slide

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Rotom-Mow @ Assault Vest

Ability: Levitate

EVs: 4 HP / 252 Def / 252 SpD

IVs: 0 Atk

- Will-O-Wisp

- Thunder

- Leaf Storm

- Volt Switch