Rate my pokemon Ubers team pls?

Question

Dracovish @ Choice Scarf
Ability: Strong Jaw
Shiny: Yes
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Fishious Rend
- Psychic Fangs
- Outrage
- Crunch

Yveltal @ Heavy-Duty Boots
Ability: Dark Aura
Shiny: Yes
EVs: 252 HP / 4 Def / 252 SpD
Careful Nature
- Snarl
- U-turn
- Defog
- Roost

Marshadow @ Life Orb
Ability: Technician
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Spectral Thief
- Close Combat
- Shadow Sneak
- Bulk Up

Eternatus @ Black Sludge
Ability: Pressure
EVs: 252 HP / 200 SpD / 56 Spe
Timid Nature
IVs: 0 Atk
- Dynamax Cannon
- Flamethrower
- Toxic
- Recover

Necrozma-Dusk-Mane @ Leftovers
Ability: Prism Armor
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Earthquake
- Morning Sun
- Sunsteel Strike
- Thunder Wave

Calyrex-Shadow @ Choice Specs
Ability: As One (Spectrier)
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Astral Barrage
- Psyshock
- Trick

Comments

why choice specs for calyrex-shadow? it's better to use life orb or heavy duty boots. necrozma-dusk-mane item can be changed to weakness policy since the ability is prism armor.

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Choice specs is to do massive damage when attacking and to cripple opponents by tricking Specs onto them. Not all Dusk Mane sets are Swords Dance/Dragon Dance sweepers lol. The set used is a defensive one, so Weakness Policy isn't useful.

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4hp on Marshadow instead of defence