Rate my Gen 5 OU Rain team!

Question

Excadrill @ Life Orb
Ability: Mold Breaker
EVs: 252 HP / 252 Atk / 4 Spe
Jolly Nature
- Earthquake
- Iron Head
- Rapid Spin
- Rock Slide

Keldeo-Resolute @ Choice Specs
Ability: Justified
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 2 Atk / 30 Def
- Scald
- Secret Sword
- Protect
- Hidden Power [Ice]

Politoed @ Rocky Helmet
Ability: Drizzle
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Toxic
- Refresh
- Scald
- Perish Song

Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 252 Def / 4 SpA
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Hydro Pump
- Thunder Wave
- Will-O-Wisp

Magnezone @ Leftovers
Ability: Magnet Pull
EVs: 252 HP / 252 SpA / 4 SpD
Modest Nature
IVs: 2 Atk / 30 SpA / 30 Spe
- Hidden Power [Fire]
- Volt Switch
- Thunderbolt
- Light Screen

Starmie @ Life Orb
Ability: Natural Cure
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
IVs: 0 Atk
- Ice Beam
- Scald
- Thunderbolt
- Signal Beam

Comments

Protect does absolutely nothing for Keldeo. Also I would suggest using Hidden Power Grass instead of Ice so you're not walled by Jellicent / Gastrodon.

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Ok
anything else?

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Yes.

I just realized you don't have a Stealth Rock setter. You could give Excadrill Stealth Rock, or you could use Ferrothorn. Ferrothorn makes for a great Stealth Rock user on rain teams because its fire weakness is halved thanks to the rain provided by Politoed. I would swap either Excadrill or Starmie for it (if you swap Excadrill, you could still use Starmie to Rapid Spin). Tentacruel is another option for a rapid spinner thanks to Rain Dish and Black Sludge allowing it to restore 12.5% of its health every turn, although that will worsen your matchup against Latios.

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Not exactly an answer but here is a guide to building rain in bw

https://www.youtube.com/watch?v=gLoR4QLoZPQ