Thought I might as well get this over with. These Pokemon do excellent on a rain team

Basculin (M) @ Muscle Band
Trait: Adaptability
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature
- Aqua Jet
- Waterfall
- Zen Headbutt
- Swagger
Basculin does pretty well at what it's supposed to do: Hit hard and hit fast. Sure, it's frail but it can kill faster than anything that can actually beat it. In the rain it is a monster with STAB Waterfall. It makes for an excellent revenge killer with Aqua Jet. Zen Headbutt can hit quite hard on Amoongus and Swagger is a personal preference.

Ampharos (M) @ Leftovers
Trait: Static
EVs: 252 SAtk / 4 HP / 252 Spd
Timid Nature
- Thunder/Thunderbolt
- Focus Blast/HP Ice
- Cotton Guard
- Heal Bell
To attack or not to attack, that is the question. On that note, Mixed Ampharos kicks butt. With Rain Dance Thunder, it can deal heavy damage with pinpoint accuracy. If it runs Focus Blast, Golurk and Amoongus pretty much screw it over, but it is much more efficient than HP Ice. If you can get a free turn, Cotton Guard can save your behind from Earthquakes. Heal bell is always useful.

Murkrow (M) @ Damp Rock/Flying Gem
Trait: Prankster
EVs: 4 HP / 252 Atk / 252 Spd
Adamant Nature
- Taunt
- Thunder Wave
- Rain Dance/Sucker Punch
- Brave Bird
Murkrow has one set and one set only. To taunt, thunder wave and set up weather. Murkrow can also screw over Amoongus with an unexpected Brave Bird. Making Ninjask users ragequit is his game. While it isn't that great, it can support any team like a boss.
I'm relatively new to competitive battling, so my ladder peak was quite low(1300-1400). These Pokemon are truly strong.