please rate this balanced gen 8 ou team (and suggest improvements)

Question

Clefable (F) @ Rocky Helmet
Ability: Magic Guard
Shiny: Yes
EVs: 160 Def / 252 SpA / 96 SpD
Modest Nature
IVs: 0 Atk
- Thunderbolt
- Soft-Boiled
- Moonblast
- Calm Mind

Diancie @ Assault Vest
Ability: Clear Body
Shiny: Yes
EVs: 248 HP / 8 Def / 250 SpA / 2 Spe
Relaxed Nature
- Diamond Storm
- Draining Kiss
- Mystical Fire
- Psychic

Melmetal @ Choice Band
Ability: Iron Fist
Shiny: Yes
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Double Iron Bash
- Thunder Punch
- Ice Punch
- Earthquake

Chansey @ Eviolite
Ability: Natural Cure
Shiny: Yes
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
- Toxic
- Aromatherapy
- Soft-Boiled
- Seismic Toss

Dragapult (M) @ Leftovers
Ability: Infiltrator
Shiny: Yes
EVs: 150 Atk / 53 Def / 53 SpD / 252 Spe
Adamant Nature
- Dragon Darts
- Dragon Dance
- Phantom Force
- U-turn

Mew @ Leftovers
Ability: Synchronize
Shiny: Yes
EVs: 252 HP / 4 Def / 252 Spe
Timid Nature
IVs: 1 Atk
- Transform
- Block
- Imprison
- Roost

Comments

Why 1 attack and not 0 attack on Mew?

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I think it was a mistype.

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What? Why do you have uesless evs?
Plus, unless there is an acrually purpose (like outspeeding somrthijg,  living a hit, or landing an ohko) theres no  eed to spread toe evs out so much even if they did do sometjin