This is an ingame rain team for Platinum wifi and PBR (not ingame CPU). I'd rather not try for Hidden Power, but I think that would only benefit Kingdra anyways (and I believe Starmie counters Gyarados pretty well, so I'm not too concerned with HP Electric). And while this is OU, I'm not particularly competitive (this is mostly for fun), so I'm not terribly concerned with countering every OU threat. I haven't played competitive in a while, so I'm way out of the loop anyway. Otherwise, rate away!
EDIT: Team has been edited and is now in its final form. I'll still be testing and am open to changes, but this is what I'm going for right now.
MONSOON SEASON
"The Storm Bringer"
Rainmaker the BRONZONG @ Damp Rock
(Impish)
Ability~Levitate
252HP/128DEF/128SPD
-Rain Dance
-Explosion
-Stealth Rocks
-Reflect
The big blue (or green?) bell sets up rocks, some extra physical protection, and then gets the rain going. He'll then explode if he needs to, or I'll go straight to a sweeper if it's safe. I'm still a bit nervous about having him as a starter, namely because he's so valuable for the rest of my team (can take quakes aimed at Jolteon and Toxicroak), but with Ludicolo's bulk and his ground resistance, I guess it won't be such an issue if I do lose him.
"The Dancing Pineapple"
Pineapple the LUDICOLO @ Life Orb
(Rash)
Ability~Swift Swim
60HP/252SPA/196SPD
-Surf
-Grass Knot
-Ice Beam
-Focus Punch
Ludicolo is my rain-abusing special sweeper (with FP for Blissey switch-ins). Surf for rainy STAB, Ice Beam for grass types, and GK for the big bulky waters (since Toxicroak can take care of Vaporeon). Considering I already have Kingdra and Toxicroak, I'm not too worried about investing any attack EVs to help Focus Punch hurt Blissey more. And Life Orb > Leftys because I have Jolt with wish support.
"The Rain Keeper"
Robobug the SCIZOR @ Damp Rock
(Adamant)
Ability~Technician
248HP/252ATK/8SPE
-Bullet Punch
-U-Turn
-Rain Dance
-Roost
Gets rid of Abomasnow and Tyranitar and gets the rain going again. Roost for longevity, and a slow U-Turn to bring out my sweepers without them taking a hit. He is almost completely meant for team support, but he can do some serious damage at the same time.
"The Lightning Bolt"
Zap the JOLTEON @ Damp Rock
(Timid)
Ability~Volt Absorb
6HP/252SPA/252SPE
-Thunder
-Rain Dance
-Thunder Wave/Substitute
-Wish/Baton Pass
Jolteon serves a few purposes here. He can come in towards the end for some cleanup with Thunder, get the rain going again quickly, help heal my LOed sweepers, provide some status support (unless there's something better that can go there), and absorb electric attacks--or more importantly, Thunder Waves. I'm also considering passing quick subs with him, but I feel like Wish support is more valuable here. We'll see what happens.
"The Rain Abuser"
Neptune the KINGDRA @ Life Orb
(Naughty)
Ability~Swift Swim
252ATK/238SPA/20SPE
-Waterfall
-Hydro Pump
-Draco Meteor
-Rain Dance
Sweeps with Waterfall, plus Hydro Pump and Draco Meteor for physical barriers/dragon types/water resists. Can also set up with rain dance if necessary.
"The Water Wannabe"
Aqua Frog the TOXICROAK @ Life Orb
(Adamant)
Ability~Dry Skin
6HP/252ATK/252SPE
-Poison Jab
-Cross Chop
-Sucker Punch
-Rain Dance
My personal favorite on this team, even if he is pretty fragile. He's my insurance against anyone trying to abuse my own rain, plus he's fun to use. I realize Poison Jab has abysmal coverage, but I like the extra STAB and bonus poisoning from time to time. If I find flying types are too common and giving me trouble, I'll happily switch Poison Jab to Stone Edge. Also another rainmaker, just because he likes it so much (especially with Life Orb). With Life Orb, I'm wondering if I should go with Jolly for nature?
EDIT: Team has been edited and is now in its final form. I'll still be testing and am open to changes, but this is what I'm going for right now.
MONSOON SEASON
"The Storm Bringer"

Rainmaker the BRONZONG @ Damp Rock
(Impish)
Ability~Levitate
252HP/128DEF/128SPD
-Rain Dance
-Explosion
-Stealth Rocks
-Reflect
The big blue (or green?) bell sets up rocks, some extra physical protection, and then gets the rain going. He'll then explode if he needs to, or I'll go straight to a sweeper if it's safe. I'm still a bit nervous about having him as a starter, namely because he's so valuable for the rest of my team (can take quakes aimed at Jolteon and Toxicroak), but with Ludicolo's bulk and his ground resistance, I guess it won't be such an issue if I do lose him.
"The Dancing Pineapple"

Pineapple the LUDICOLO @ Life Orb
(Rash)
Ability~Swift Swim
60HP/252SPA/196SPD
-Surf
-Grass Knot
-Ice Beam
-Focus Punch
Ludicolo is my rain-abusing special sweeper (with FP for Blissey switch-ins). Surf for rainy STAB, Ice Beam for grass types, and GK for the big bulky waters (since Toxicroak can take care of Vaporeon). Considering I already have Kingdra and Toxicroak, I'm not too worried about investing any attack EVs to help Focus Punch hurt Blissey more. And Life Orb > Leftys because I have Jolt with wish support.
"The Rain Keeper"

Robobug the SCIZOR @ Damp Rock
(Adamant)
Ability~Technician
248HP/252ATK/8SPE
-Bullet Punch
-U-Turn
-Rain Dance
-Roost
Gets rid of Abomasnow and Tyranitar and gets the rain going again. Roost for longevity, and a slow U-Turn to bring out my sweepers without them taking a hit. He is almost completely meant for team support, but he can do some serious damage at the same time.
"The Lightning Bolt"

Zap the JOLTEON @ Damp Rock
(Timid)
Ability~Volt Absorb
6HP/252SPA/252SPE
-Thunder
-Rain Dance
-Thunder Wave/Substitute
-Wish/Baton Pass
Jolteon serves a few purposes here. He can come in towards the end for some cleanup with Thunder, get the rain going again quickly, help heal my LOed sweepers, provide some status support (unless there's something better that can go there), and absorb electric attacks--or more importantly, Thunder Waves. I'm also considering passing quick subs with him, but I feel like Wish support is more valuable here. We'll see what happens.
"The Rain Abuser"

Neptune the KINGDRA @ Life Orb
(Naughty)
Ability~Swift Swim
252ATK/238SPA/20SPE
-Waterfall
-Hydro Pump
-Draco Meteor
-Rain Dance
Sweeps with Waterfall, plus Hydro Pump and Draco Meteor for physical barriers/dragon types/water resists. Can also set up with rain dance if necessary.
"The Water Wannabe"

Aqua Frog the TOXICROAK @ Life Orb
(Adamant)
Ability~Dry Skin
6HP/252ATK/252SPE
-Poison Jab
-Cross Chop
-Sucker Punch
-Rain Dance
My personal favorite on this team, even if he is pretty fragile. He's my insurance against anyone trying to abuse my own rain, plus he's fun to use. I realize Poison Jab has abysmal coverage, but I like the extra STAB and bonus poisoning from time to time. If I find flying types are too common and giving me trouble, I'll happily switch Poison Jab to Stone Edge. Also another rainmaker, just because he likes it so much (especially with Life Orb). With Life Orb, I'm wondering if I should go with Jolly for nature?