The current rain turn team I have been using is
Specs Politoed (rain, wrecks)
Bulky Rotom-W with WoW and Pain Split
CB Scizor
Flying Plate Tornadus (Uturn, Hurricane, Focus Blast, Tailwind)
Forretress (Rapid Spin, rocks, spikes, volt swich)
Specially defensive Celebi (giga drain, uturn, recover, perish song)
Still needs lots of testing; have not played it much as the HO team has been wreaking ;)