This is my first time really getting into competitive in a few years, but I threw together a rain team at least to get started. It's for ranked doubles
Politoed @ Damp Rock
Ability: Drizzle
EVs: 252 HP/252 SpA/4 SpD
Modest Nature
-Surf
-Blizzard
-Focus Blast
-Protect
Gastrodon @ Rindo Berry
Ability: Storm Drain
EVs: 152 HP/92 Def/252 SpA/12 SpD
IVs: 2 Atk/0 Spe
Quiet Nature
-Scald
-Ice Beam
-Earth Power
-Protect
Barraskewda @ Choice Band
Ability: Swift Swim
EVs: 252 Atk/4 SpD/252 Spe
Adamant Nature
-Waterfall
-Close Combat
-Crunch
-Flip Turn
Scizor @ Metal Coat
Ability: Technician
EVs: 252 HP/252 Atk/4 SpD
Adamant Nature
-X-Scissor
-Bullet Punch
-Dual Wingbeat
-Swords Dance
Cloyster @ White Herb
Ability: Skill Link
EVs: 252 Atk/4 SpA/252 Spe
Naive Nature
-Icicle Spear
-Surf
-Rock Blast
-Shell Smash
Amoongus @ Leftovers
Ability: Regenerator
EVs: 236 HP/116 Def/156 SpD
IVs: 0 Atk/0 Spe
Sassy Nature
-Giga Drain
-Clear Smog
-Spore
-Rage Powder
I will pretty much always lead with Politoed and try to use Surf to give Gastrodon Special Attack boosts. Gastrodon Dynamaxes quite a bit of the time to improve its bulk and maybe get some Special defense boosts with Dynamaxed Earth Power. Amoongus is usually there for backup to use Rage Powder and let something boost up or get maybe a free hit.
Politoed @ Damp Rock
Ability: Drizzle
EVs: 252 HP/252 SpA/4 SpD
Modest Nature
-Surf
-Blizzard
-Focus Blast
-Protect
Gastrodon @ Rindo Berry
Ability: Storm Drain
EVs: 152 HP/92 Def/252 SpA/12 SpD
IVs: 2 Atk/0 Spe
Quiet Nature
-Scald
-Ice Beam
-Earth Power
-Protect
Barraskewda @ Choice Band
Ability: Swift Swim
EVs: 252 Atk/4 SpD/252 Spe
Adamant Nature
-Waterfall
-Close Combat
-Crunch
-Flip Turn
Scizor @ Metal Coat
Ability: Technician
EVs: 252 HP/252 Atk/4 SpD
Adamant Nature
-X-Scissor
-Bullet Punch
-Dual Wingbeat
-Swords Dance
Cloyster @ White Herb
Ability: Skill Link
EVs: 252 Atk/4 SpA/252 Spe
Naive Nature
-Icicle Spear
-Surf
-Rock Blast
-Shell Smash
Amoongus @ Leftovers
Ability: Regenerator
EVs: 236 HP/116 Def/156 SpD
IVs: 0 Atk/0 Spe
Sassy Nature
-Giga Drain
-Clear Smog
-Spore
-Rage Powder
I will pretty much always lead with Politoed and try to use Surf to give Gastrodon Special Attack boosts. Gastrodon Dynamaxes quite a bit of the time to improve its bulk and maybe get some Special defense boosts with Dynamaxed Earth Power. Amoongus is usually there for backup to use Rage Powder and let something boost up or get maybe a free hit.