Rate my Gen 8 Double Ubers team

Question

Calyrex-Shadow @ Focus Sash
Ability: As One (Spectrier)
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Astral Barrage
- Expanding Force
- Giga Drain
- Nasty Plot

Terrakion @ Life Orb
Ability: Justified
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- X-Scissor
- Earthquake
- Stone Edge

Regieleki @ Focus Sash
Ability: Transistor
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Rising Voltage
- Thunderbolt
- Electro Ball
- Volt Switch

Indeedee-F @ Psychic Seed (support Calyrex-Shadow)
Ability: Psychic Surge
Shiny: Yes
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Expanding Force
- Helping Hand
- Follow Me
- Protect

Whimsicott @ Focus Sash (support Terakion)
Ability: Prankster
Shiny: Yes
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
- Tailwind
- Beat Up
- Trick Room
- Moonblast

Tapu Koko @ Electric Seed (support Regieleki)
Ability: Electric Surge
Shiny: Yes
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Nature's Madness
- Volt Switch
- Electroweb
- Protect

Answer 1

Ok, i don't remember if having multiple pokemon with the same item is allowed or not, i'll just give a few notes.

1. You have so many fast pokemon, so don't use trick room on whimsicott. Go for taunt instead
2. Dazzling Gleam > Nature's Madness, because it hits both foes and more versatile than Nature's Madness.
3. You don't have any defoggers, try considering Yveltal. I haven't use Yveltal so this set might not be the best.

Yveltal @ Life Orb
Ability: Dark Aura
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Defog
- Oblivion Wing
- Dark Pulse
- Sucker Punch

Comments

Defog in doubles ubers? But nobody uses hazards there. This honestly seems more like a comment to me, as you seem to not know about the meta much (you don’t know if the item clause applies, if the set is good that’s you’re suggesting, or if a defogger is needed when most teams don’t have one)

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I have many fast Pokemons,  so I use Trick room on Whimsicott to counter the opponent's Trick room
Thank you so much!