Politoed @ wacan berry
modest
drizzle(obviously)
-surf
-ice beam
-hidden power (fire 70)
-protect
IVs:30 attack 30 special attack 30 speed
EVs:252 HP 252 special attack 4 special defense
I obviously have this guy to set up permanent rain so I can abuse it for the rest of the match. There are HP and special attack evs so he can switch in and out to control the weather and dish out some damage at the same time.
Pineapple(Ludicolo) @ absorb bulb
modest
swift swim
-fake out
-hydro pump
-giga drain
-protect
EVs:172 HP 252 special attack 84 speed
Ludicolo is super fast thanks to swift swim and doesn't need to waste a move-slot for a boosting move since I just send out kingdra and use surf, activating his absorb bulb and proceeding to sweep with hydro pump (I already have a surf and scald user and I like the extra power) and giga drain.
Kingdra @ life orb
modest
swift swim
-surf
-ice beam
-draco meteor
-protect
EVs: 4 HP 252 special attack 252 speed
Kingdra is what I consider to be my main special sweeper. I ran dragon pulse instead of draco meteor because I'm afraid that the special attack drop and the accuracy are going to make me lose. It is also my second best lati@s counter because it can out-speed and KO with a life orb boosted dragon pulse.
Scizor @ choice band
adamant
technician
-bug bite
-bullet punch
-superpower
-aerial ace
EVs:248 HP 252 attack 8 special defense
I run scizor because he is one of the coolest looking Pokemon and is a great physical sweeper that usually gets left out of rain teams for metagross. Without the need for an occa berry (rain halves the damage of fire type moves), I can run a choice band which will surprise my opponent (choice banded STAB technician bullet punch really hurts). Scizor is extremely crucial on this team, because without him, I can't really touch cresselia, ludicolo, shedinja, toxicroak, breloom, or sableye.
Rotom-W @ Choice Specs
modest
levitate
-Hydro pump
-thunder
-hidden power (grass 70)
-protect
IVs:30 attack 30 special attack
EVs: 252 HP 252 special attack 4 special defense
Thunder is also a good move for dealing with opposing rain teams and taking out those nasty flying types (bar thundurus) who tend to cut my toxicroak's sweep short. Hidden power ice allows me to hit dragons and do decent damage to thundurus. The Choice specs is because without it there's not enough power. Volt switch is better than protect with specs
Toxicroak @ black sludge
adamant
dry skin
-fake out
-drain punch
-sucker punch
-protect
EVs:252 HP 252 attack 4 speed
Toxicroak is the best abuser of dry skin, healing twice every turn because of black sludge and rain, healing because of my Kingdra's surf, and maybe healing because of drain punch. It becomes almost impossible to take out if you don't have a flying type or flying gem acrobatics scizor on your team. It is also the best Lati@s counter on this team. Fake out will make the Lati@s flinch, and sucker punch OHKOs.
Edits are in blue.