Lullaby (Uxie) @ Damp Rock

Trait: Levitate
EVs: 4 HP / 252 Def / 252 SDef
Adamant Nature (+Atk, -SAtk)
- Rain Dance
- U-turn
- Magic Coat
- Zen Headbutt
My Lead, Magic Coat deflects hazards targeted for my team. Zen Headbutt can hit decently hard for STAB.
Rain Dance makes use of Damp Rock, and lets Rain last for 8 turns, because Politoed isn't useable in RU.
And U-Turn lets him do damage while switching out to make the most use of the rain.
Bosstoise (Blastoise) (F) @ Choice Scarf

Trait: Rain Dish
EVs: 8 HP / 40 Def / 252 SAtk / 208 Spd
Modest Nature (+SAtk, -Atk)
- Water Spout
- Hidden Power [Bug]
- Ice Beam
- Focus Blast
One of my rainy sweepers, Water Spout + Choice Scarf is hard to top with STAB and a rain boost.
HP Bug gets great coverage when paired with Water and Ice, and speaking of Ice. We have Ice Beam for further coverage, and Focus Blast, for even more coverage.
Mii Rancho (Rotom-C) @ Damp Rock

Trait: Levitate
EVs: 64 Def / 252 SAtk / 64 SDef / 128 Spd
Timid Nature (+Spd, -Atk)
- Rain Dance
- Thunder
- Leaf Storm
- Volt Switch
My 2nd pokemon who can set up rain, while he can also make use of it.
Thunder gives him high powered STAB, Leaf Storm is if he's gonna go down soon, or if the rain goes out, and Volt Switch is the pass on the rain's effects to someone else, while letting damage be done doing it.
Purple ftw (Toxicroak) (F) @ Black Sludge

Trait: Dry Skin
EVs: 64 HP / 128 Atk / 32 Def / 252 SDef / 32 Spd
Careful Nature (+SDef, -SAtk)
- Bulk Up
- Drain Punch
- Sucker Punch
- Poison Jab
Black Sludge + Dry Skin, lets him easily set up Bulk up, and after doing that he has Drain Punch for STAB and constant healing, Poison Jab for STAB and coverage, and Sucker Punch for coverage, Priority, and psychic killing.
BABIES (Scolipede) (M) @ Leftovers

Trait: Swarm
EVs: 4 HP / 252 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Swords Dance
- Megahorn
- Rock Slide
- Earthquake
My choice of straight up set up n sweeping for this team, rain covers out a fire weakness, but he can operate at full power without rain in the field. That being said. Swords Dance is for setting up an awesome attack boost, while Rock Slide is coverage and flinch rate, and Earthquake is coverage.
lolhaider (Swanna) (F) @ Life Orb

Trait: Hydration
EVs: 4 HP / 252 SAtk / 252 Spd
Modest Nature (+SAtk, -Atk)
- Hurricane
- Surf
- Ice Beam
- Rain Dance
A Solid 300 Sp Atk stat, gets boost from Life orb.
Surf lets him get some STAB and Rain boost power, while Hurricane gets STAB and 100% accuracy.
The Last slot is for either Healing off Life orb damage over an opponent trying to set up, or keeping the rain going, but only being able to do it for 5 turns.
Note: I'm not going to take " Don't use weather unless you instant weather with Drizzle, Drought etc. As a suggestion, because it's not.