Rain Team Help

Hey, I'm making me a new team based around rain for BW2 wifi.
I have created one and need to rate and comment.

http://veekun.com/dex/media/pokemon/dream-world/186.svg
1.Politoed - the rain abuser
Ability: Drizzle Nature: Bold
Item: ? (wacan berry/switch card/eject card)
-Scald
-Toxic
-Protect
-Encore
EV: 252hp/216def/40spdef. Any other suggestion?

http://veekun.com/dex/media/pokemon/sugimori/598.png
2.Ferrothorn - bulky stealth rock user
Nature: Relaxed
Item: Leftovers
-Power Whip
-Stealth Rock
-Gyro Ball
-Lech Seed (if i cant get it then ingrain)
EV:252hp/88def/168spdef

http://veekun.com/dex/media/pokemon/dream-world/121.svg
3. Starmie - spinner
Ability: Natural Cure Nature: Timid
Item: Choice Scarf
-Surf (because hydro pump has low accuracy)
-Ice Beam
-Thunder
-Rapid Spin
EV:252spa/252speed/4def

http://veekun.com/dex/media/pokemon/conquest/149.png
4. Dragonite
Ability: Multiscale Nature: Mild
Item: Life Orb
-Hurricane
-Thunder
-Roost
-Dragon Tail (for switching enemies and dealing damage from stelth rock)
EV:76atk/252spa/180speed

http://veekun.com/dex/media/pokemon/sugimori/454.png
5. Toxicroak
Ability: Dry Skin Nature: Adamant
Item: Black Sludge
-drain punch
-sucker punch
-bulk up
-substitute
EV:244hp/252atk/12def

http://veekun.com/dex/media/pokemon/dream-world/423-west.svg
6. Gastrodon - anti-rain
Ability: storm drain Nature: modest
Item: choice specs.
-surf
-earth power
-ice beam
-recover
EV:160hp/36def/252spa/60spdef

Thx for any help!!!

Politoed would use Lefties, but I'd recommend Sitrus Berry for the sake of Item Clause.

Leech Seed is important for Ferrothorn; don't even bother with Ingrain, since it forces Ferrothorn to stay in battle, and that's not good since Fire and Fighting Pokémon can force it out easily.

Really, I don't see the point on Rapid Spin on Choice Scarf Starmie because it'll be locked in the move when it uses it, which can force it out. Use Expert Belt, since it has good supereffective coverage.

I'd rather not use Dragon Tail on offensive mixed Dragonite because the negative priority is annoying for something that doesn't invest in defenses at all:
-Hurricane
-Thunder
-Superpower/Aqua Tail
-Roost/ExtremeSpeed/Earthquake
Nature: Mild
EVs: 76 Atk/252 SAtk/180 Spe
Item: Life Orb
Ability: Multiscale

Dragonite should only use Dragon Tail on a defensive set:
-Hurricane
-Thunder
-Dragon Tail
-Roost
Nature: Calm
EVs: 252 HP/4 SAtk/252 SDef
Item: Leftovers
Ability: Multiscale

Get with the B2/W2 changes here; change Toxicroak's EV spread to 244 HP/132 Atk/120 Def/12 Spe to prevent any Terrakion variant that doesn't use Earthquake from 2HKOing it.

Same applies to Gastrodon; use the EV spread of 124 HP/252 SAtk/132 SDef. Recover should only be used with Life Orb; otherwise use Hidden Power (Grass)

Thanks for help i will change it and think about what changes will apply. You're great as always