Okay, so even if it can be argued that Rain is not the most dominant playstyle, it is sure common. So, let's beat it.
Importable

Slowking-Galar @ Heavy-Duty Boots/Icy Rock
Ability: Regenerator
Tera Type: Water
EVs: 252 HP / 16 Def / 240 SpD
Sassy Nature
IVs: 0 Spe
- Future Sight
- Chilly Reception
- Sludge Bomb
- Thunder Wave
Goofy King is here! Sporting annoying moves to cripple the enemy like Thunder Wave, the poison chance on Sludge Bomb (you'll be surprised how many poisons I have, though I am lucky) and the ever strong FuturePort loadout, with Chilly Reception being a great choice to change weather and to support our two hail attackers. Not much else to say, classic Glowking. My choice to give Icy Rock an honorable mention for sets is mentioned below in the Ninetales section.

Ninetales-Alola @ Icy Rock
Ability: Snow Warning
Tera Type: Water
EVs: 248 HP / 8 Def / 252 Spe
Timid Nature
- Aurora Veil
- Encore
- Freeze-Dry
- Moonblast
God save our gracious veil, long live our noble veil...
Anyway, even if it is currently a UU mon, Veils from the Tales is always going to be helpful for some teams. Using mostly the normal sets, it is a fantastic disruptor and support. What else do I say? Oh right, WHY AM I USING ICY ROCK? This is a hail team, not a veil team. Most of my members need at max 2 turns of setup. Without my Icy Rock, Cetitan has much shorter lifespan, and Kyruem can't get that juicy defence boost. (You can use Abomasnow here, I experimented with it to underspeed Pelipper, otherwise obviously use Tales)

Ogerpon-Wellspring (F) @ Wellspring Mask
Ability: Water Absorb
Tera Type: Water
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Ivy Cudgel
- Power Whip
- Stomping Tantrum
I've always thought Ogerpon was like Batman. Wearing a mask, misunderstood... but one of Batman's qualities is that he is versatile and has many gadgets. Ogerpon, also, has many things in its arsenal. So this is SD Ogerpon running Stomping Tantrum. I originally picked this out just for Archaludon, but the amount of times Power Whip has missed is infuriating, sooo... Yeah. Anyway, this is our team's resident Arch killer and CB Barraskewda punisher.

Cetitan @ Sitrus Berry
Ability: Slush Rush
Tera Type: Fighting/Electric
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Belly Drum
- Ice Shard/Ice Spinner
- Earthquake
- Superpower/Tera Blast
Oh wow, he's back. Cetitan, the drummer, has appeared. You know Cetitan's plan-get in with Veil up, Belly Drum, go ham. EQ and Superpower are my coverage moves of choice, but you can run Tera Blast Electric for BoltBeam coverage. I use Ice Shard just so I don't have to switch it back out once hail ends, but Ice Spinner+Icy Rock works. Don't you dare run Ice Spinner with no Icy Rocks! 4 turns is not nearly enough to make it up.

Kyurem @ Choice Specs
Ability: Pressure
Tera Type: Fairy
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Blizzard
- Freeze-Dry
- Draco Meteor
- Earth Power
Specs Blizzard. Okay, next!
Okay, but this is literally specs Kyruem with Ice Beam substituted for Blizzard, so uh... uh... uh... HERE! The writers of the top passage have put in a lot of detail, what else should I add?

Great Tusk @ Booster Energy
Ability: Protosynthesis
Tera Type: Poison
EVs: 252 HP / 4 Atk / 252 Spe
Jolly Nature
- Bulk Up
- Headlong Rush
- Rapid Spin
- Close Combat
3 of my members are ice types. Ice types take 25% from Stealth Rocks. Cetitan will die in one turn with rocks+3 layers of spikes+Belly Drum. So, spinner. Tusk here is also a wincon with Bulk Up under Veil, and therefore this set is a weird hybrid between utility and damage. Better people have said things about this mon, but we are here to refute people who said that Tusk fell off. No. Tusk is better than ever. Tera Steel for a water resistance that is crucial for an anti-rain team.
Importable

Slowking-Galar @ Heavy-Duty Boots/Icy Rock
Ability: Regenerator
Tera Type: Water
EVs: 252 HP / 16 Def / 240 SpD
Sassy Nature
IVs: 0 Spe
- Future Sight
- Chilly Reception
- Sludge Bomb
- Thunder Wave
Goofy King is here! Sporting annoying moves to cripple the enemy like Thunder Wave, the poison chance on Sludge Bomb (you'll be surprised how many poisons I have, though I am lucky) and the ever strong FuturePort loadout, with Chilly Reception being a great choice to change weather and to support our two hail attackers. Not much else to say, classic Glowking. My choice to give Icy Rock an honorable mention for sets is mentioned below in the Ninetales section.

Ninetales-Alola @ Icy Rock
Ability: Snow Warning
Tera Type: Water
EVs: 248 HP / 8 Def / 252 Spe
Timid Nature
- Aurora Veil
- Encore
- Freeze-Dry
- Moonblast
God save our gracious veil, long live our noble veil...
Anyway, even if it is currently a UU mon, Veils from the Tales is always going to be helpful for some teams. Using mostly the normal sets, it is a fantastic disruptor and support. What else do I say? Oh right, WHY AM I USING ICY ROCK? This is a hail team, not a veil team. Most of my members need at max 2 turns of setup. Without my Icy Rock, Cetitan has much shorter lifespan, and Kyruem can't get that juicy defence boost. (You can use Abomasnow here, I experimented with it to underspeed Pelipper, otherwise obviously use Tales)
Abomasnow @ Icy Rock
Ability: Snow Warning
Tera Type: Fire
EVs: 248 HP / 8 SpA / 252 SpD
Sassy Nature
IVs: 0 Atk / 0 Spe
- Aurora Veil
- Blizzard
- Leech Seed
- Protect
Ability: Snow Warning
Tera Type: Fire
EVs: 248 HP / 8 SpA / 252 SpD
Sassy Nature
IVs: 0 Atk / 0 Spe
- Aurora Veil
- Blizzard
- Leech Seed
- Protect

Ogerpon-Wellspring (F) @ Wellspring Mask
Ability: Water Absorb
Tera Type: Water
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Ivy Cudgel
- Power Whip
- Stomping Tantrum
I've always thought Ogerpon was like Batman. Wearing a mask, misunderstood... but one of Batman's qualities is that he is versatile and has many gadgets. Ogerpon, also, has many things in its arsenal. So this is SD Ogerpon running Stomping Tantrum. I originally picked this out just for Archaludon, but the amount of times Power Whip has missed is infuriating, sooo... Yeah. Anyway, this is our team's resident Arch killer and CB Barraskewda punisher.

Cetitan @ Sitrus Berry
Ability: Slush Rush
Tera Type: Fighting/Electric
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Belly Drum
- Ice Shard/Ice Spinner
- Earthquake
- Superpower/Tera Blast
Oh wow, he's back. Cetitan, the drummer, has appeared. You know Cetitan's plan-get in with Veil up, Belly Drum, go ham. EQ and Superpower are my coverage moves of choice, but you can run Tera Blast Electric for BoltBeam coverage. I use Ice Shard just so I don't have to switch it back out once hail ends, but Ice Spinner+Icy Rock works. Don't you dare run Ice Spinner with no Icy Rocks! 4 turns is not nearly enough to make it up.

Kyurem @ Choice Specs
Ability: Pressure
Tera Type: Fairy
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Blizzard
- Freeze-Dry
- Draco Meteor
- Earth Power
Specs Blizzard. Okay, next!
Okay, but this is literally specs Kyruem with Ice Beam substituted for Blizzard, so uh... uh... uh... HERE! The writers of the top passage have put in a lot of detail, what else should I add?

Great Tusk @ Booster Energy
Ability: Protosynthesis
Tera Type: Poison
EVs: 252 HP / 4 Atk / 252 Spe
Jolly Nature
- Bulk Up
- Headlong Rush
- Rapid Spin
- Close Combat
3 of my members are ice types. Ice types take 25% from Stealth Rocks. Cetitan will die in one turn with rocks+3 layers of spikes+Belly Drum. So, spinner. Tusk here is also a wincon with Bulk Up under Veil, and therefore this set is a weird hybrid between utility and damage. Better people have said things about this mon, but we are here to refute people who said that Tusk fell off. No. Tusk is better than ever. Tera Steel for a water resistance that is crucial for an anti-rain team.
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