There are better Choice Specs Pokemon to use than Galarian Slowbro, like Regieleki. Galarian Slowbro is incredibly slow (obviously) and is usually used on Trick Room teams. Besides that, Surf also will hit your teammates, and none of them are immune to Water or even resist it. You'll just end up smacking your teammates with Specs, max SpA Surfs. You don't really want that. Galarian Slowbro, being a Poison/Psychic type, is weak to the ever-present Incineroar's Dark STAB. It doesn't have bad defense at base 95, but look at this damage calc.
252+ Atk Incineroar Knock Off (97.5 BP) vs. 252 HP / 0 Def Slowbro-Galar: 336-396 (85.2 - 100.5%) -- 6.3% chance to OHKO.
Max Attack Assault Vest Incineroar is extremely common when just starting out in Doubles OU, and Knock Off is used 45.973% of the time on said Incineroar. If Incineroar gets a Fake Out off on Slowbro before using Knock Off, it'll be a guaranteed OHKO with it taking no damage from Slowbro itself.
Galarian Slowking is DUU and doubles games simply move too fast to set up for Stored Power.
Run Away is completely and utterly useless, use Pastel Veil instead. Pastel Veil is actually useful, as it prevents you and your allies from being Poisoned by Toxic. Also, why do you have Agility twice? Thrash is generally terrible. If you still want to use it, try something like this.
Rapidash-Galar @ Life Orb
Ability: Pastel Veil
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Swords Dance
- Play Rough
- High Horsepower
- Zen Headbutt / Wild Charge
You might want to pair it with a Rage Powder/Follow Me user such as Amoonguss for safe set-up.
Mixed Galarian Corsola.......Corsola is defensive and shouldn't be offensive. Even then, it's still subpar. I would switch it for Cresselia or Amoonguss.
Amoonguss @ Sitrus Berry
Ability: Regenerator
EVs: 252 HP / 184 Def / 72 SpD
Bold Nature
- Pollen Puff
- Rage Powder
- Spore
- Protect
If you're going to use Galarian Articuno, make it a speedy special attacker. Why would you have Dream Eater with *no sleep moves on the whole team?* Again, Calm Mind set-up probably isn't the best.
Articuno-Galar @ Choice Scarf/Specs
Ability: Competitve
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Freezing Glare
- Hurricane / Air Slash
- Shadow Ball
- U-Turn
Galarian Meowth should not be used, like, ever. Especially not with this set lol. With monster Steel-type physical attackers like Kartana and Excadrill in the tier, why would you turn to Galarian Meowth? Spite is almost useless, Galarian Meowth's Special Attack is 40 base and you don't have any investment so don't use Thunder (ever) and Expert Belt isn't the b e s t item.
Here are some possible replacements for Galarian Meowth:
https://pokepast.es/b3dd059d3154e62b
Here's a Pokepaste of the team I would use:
https://pokepast.es/278f2f6afe397089