Any ideas to improve my gen 8 competitive team?

Question

I've been working on my competitive team for sword and sheild. If you see anything that can be improved, please tell me. Thanks.

Gigalith @ Life Orb
Ability: Sand Stream
EVs: 4 HP / 252 Atk / 252 Def
Impish Nature
- Stealth Rock
- Stone Edge
- Body Press
- Earthquake

Butterfree-Gmax @ Focus Sash
Ability: Tinted Lens
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hurricane
- U-turn
- Bug Buzz
- Sleep Powder

Mimikyu @ Life Orb
Ability: Disguise
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Play Rough
- Shadow Claw
- Shadow Sneak
- Swords Dance

Rotom-Wash @ Choice Specs
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Pump
- Thunderbolt
- Protect
- Shadow Ball

Arcanine @ Leftovers
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Close Combat
- Iron Head
- Body Slam
- Flame Charge

Darmanitan-Galar @ Choice Scarf
Ability: Gorilla Tactics
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Flare Blitz
- Icicle Crash
- Earthquake
- Superpower

Comments

no one is benefitting from gigalith's sand, especially butterfree which loses its focus sash after one turn of sandstorm

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Yeah, but it really help get the other team down, and I dont send out butterfree till the very end

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also some flaws
choice specs protect on rotom, as well as shadow ball not covering any weakness, so volt switch over shadow ball imo
body slam and iron head on arcanine are both useless, replace with morning sun and maybe wild charge
you probably want u turn on darmanitan galar over either earthquake or superpower
compound eyes over tinted lens on butterfree so you don't miss sleep powder that often

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Thanks for the advice