Rate my gen 7 ou team- since nobody rates my teams

Question

Diancie-Mega @ Diancite
Ability: Magic Bounce
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Stealth Rock
- Diamond Storm
- Earth Power
- Moonblast

Tyranitar @ Choice Band
Ability: Sand Stream
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Pursuit
- Stone Edge
- Crunch
- Fire Punch

Thundurus-Therian (M) @ Life Orb
Ability: Volt Absorb
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Thunderbolt
- Sludge Bomb
- Hidden Power [Ice]

Persian-Alola @ Darkinium Z
Ability: Fur Coat
EVs: 252 HP / 4 Atk / 252 Spe
Jolly Nature
- Fake Out
- Parting Shot
- Foul Play
- Taunt

Kartana @ Choice Scarf
Ability: Beast Boost
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Leaf Blade
- Defog
- Sacred Sword
- Smart Strike

Celesteela @ Weakness Policy
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Autotomize
- Air Slash
- Fire Blast
- Flash Cannon

Comments

Nobody rates your teams because they're all so perfect and untouchable. Moving any 4 of your EVs would be like adding a speck of red paint to Mona Lisa's face.

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Your team lacks synergy of any sort. It's horrible against rain teams. The team seems good on paper, but you should test it out a little bit before asking for an opinion.