How can I improve this Battle Tree team for double battles?

Question

I usually use the following team in double battles:

Sylveon @ Quick Claw
Ability: Cute Charm
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 0 Atk
- Moonblast
- Protect
- Shadow Ball
- Draining Kiss

Metagross @ Focus Sash
Ability: Clear Body
EVs: 252 HP / 252 Atk / 4 SpA
Brave Nature
- Bullet Punch
- Earthquake
- Psychic
- Meteor Mash

Kartana @ Fightinium Z
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Sacred Sword
- X-Scissor
- Smart Strike

Greninja @ Waterium Z
Ability: Battle Bond
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Hydro Pump
- Ice Beam
- Night Slash
- Water Shuriken

Comments

This section is more about rating teams than what you've outlined in the title, though I don't see a point in taking this down. I hope you don't mind me repurposing this as a normal "rate my team" thread, so it's consistent with the rest of the section.

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Replace Sylveon, Metagross, and Greninja with Tapu Fini for better stats and status immunity, Cresselia for better stats and movepool, and Hydreigon for better stats. Give Kartana a fightinium z and replace x-scissor with protect.