https://pokepast.es/53b6b43933c335f0
I'm just gonna make this quick. Your team is an auto lose to hail. Once Arctozolt comes in, it is just gonna drop your mons left and right
As such, replaced Lando with Hippo. It still does most of the same stuff as Lando and with whirlwind, you have a temporary leeway against Garchomp and Volcarona. Perhaps most importantly, it allows you to contest the weather against Alolan Ninetales and ensures Arctozolt isn't having a field day
I optimized the set for Fini. That speed is to outspeed 120 speed Heatran while maximizing physical bulk to handle opposing Urshifus and Weaviles
Use boots Weavile. A lot of this thing's viability comes from its boots allowing it to ignore stealth rock. Triple axel is usually the preferred stab move because of its power and it has the same accuracy as icicle crash anyway
I've also optimized the set for Galarian Slowking. I'm not sure what it does I just found that on smogon. I think it is supposed to live one Urshifu surging strikes without rocks from full. Also, use ice beam on this thing. Do not let Garchomp get a free switch
I also replaced Heatran for Scizor to serve as your steel type. You already have Fini as a trapper so you don't need a second one. Scizor is basically to ensure you don't play a dangerous game of russian roulette against Tapu Lele. That ev spread is to survive two modest specs psychics from full. You can use Corviknight in this slot if you want hazard removal but your team generally doesn't mind hazards that much
Finally, I changed thunderbolt to flamethrower on Dragapult. Don't bother trying to kill Pex with this thing. It's not worth it and if you lock yourself into thunderbolt, you're just giving a free switch to Garchomp
Now, why did I mention Garchom as a threat if you have Weavile? Well, because Garchomp is the only pokemon in ou that can run every single item in the game and run them effectively. If Garchomp has yache berry and your Hippo is weakened, your team instantly loses to it. Weavile's ice shard won't kill it if it has the berry. That's also part of the reason why I put double priority on your team because in my experience, yache berry Garchomp completely destroys the standard Weavile set