@PlatinumDude - Anything goes in doubles VGC. Restrictions are item clause and species clause, and that banned pokemon list. And that you can only send in 4 pokemon.
Back to op.
Have you battled over wifi rated? That will give you a much better idea of what you'll be facing in the tournament. Keep in mind that the tournament is in doubles, not singles. Your two teams look as if it's built more for singles than for doubles.
The Volt-turn team looks like a disaster waiting to happen to me. ATM I can't explain why. I'll need to study that team a bit more before I can decide what can be improved or whether it should be scrapped completely. The rain team, I may be able to help since I run primarily rain.
Edit: Scrap that Volt-turn team completely. It's a glass cannon team (powerful, but easy to kill). You don't want glass cannons in the team unless you have something bulky that can take hits in return and dish them back out.
Ditch the Forretress. You can try using set-up moves but most of the time, all you will manage to send out is a Stealth Rock or a single layer of Spikes. The other problem is that Forretress will only be able to stall, and won't dish nearly enough damage to do well, anything. It's setup bait and near worthless in doubles. Use Ferrothorn instead. It's far superior than Forretress, it's got the ever-useful water resist AND sandstorm boost (weather teams run amuck in doubles), its defenses on both ends are useful (Forretress can't defend against special attacks and there's far more special attackers than physical in doubles) and its standard set is extremely annoying.
Ferrothorn w/ Leftovers
Nature: Relaxed
EVs: 252 HP / 148 Def / 108 SpD
~ Leech Seed
~ Protect
~ Power Whip
~ Gyro Ball
Note: The speed IV must be at 0 in order to use Gyro Ball at full power.
Your team is terribly weak against teams that are anti-rain. I'm talking about pokemon like Ferrothorn, electric types (rare), Jynx, Gastrodon, anything that has Dry Skin, Water Absorb, Storm Drain, Hydration or grass moves. If you dislike the accuracy of Hydro Pump but want something strong and useful, you can swap it for Scald (burn chance) or Surf (hits everything on the field).
Politoed and Kingdra looks good. You can turn Dnite into a revenge killer by changing Aqua Tail or Roost to Extremespeed. You might want to switch out Roost. My experience is that when the opponent starts to target Dnite, they won't leave it surviving long enough to get a Roost in. Multiscale works only if your HP is at maximum so Roost becomes ineffective if it doesn't heal the HP fully. Not everything on your team needs water moves. You will need a great deal of flexibility in doubles. I'm hesitant about Vaporeon, Quagsire and Raikou.
Quagsire is doing absolutely zilch for your team. It's too weak, not bulky enough, the ability is useless since almost no one uses status up moves. Use Gastrodon. Same weaknesses but Storm Drain is infinitely more useful, especially if opponent is using an opposing rain team.
Gastrodon w/ Rindo Berry, Sitrus Berry, Leftovers
Ability: Storm Drain
Nature: Bold
252 HP|252 Def|4 SpD
~ Surf / Muddy Water
~ Icy Wind / Ice Beam
~ Toxic / Earth Power
~ Recover / Protect
Raikou has only one purpose in Doubles and that's to do as much damage as possible before it dies. It's a glass cannon, Calm Mind will not help whatsoever. Use the standard Special Attacker set.
Raikou @ Air Balloon / Life Orb / Choice Scarf / Choice Specs
Ability: Pressure
Nature: Rash / Timid
~ Thunderbolt / Thunder
~ Hidden Power Ice / Hidden Power Grass
~ Aura Sphere / Rain Dance
~ Protect / ExtremeSpeed
Alright, I'll admit I took a few liberties with this set. The reason I added Choice Scarf/Specs is to let you decide what you want to do. Scarf will let you attack before just about anything not using priority or Prankster or holding Scarf. Specs let you get far more power off than Life Orb. With both, you sacrifice adaptability. Consider it carefully. No matter which item you select for Raikou, it will be crippled by paralysis. ExtremeSpeed to pick off anything nearly dead.
Vaporeon's item needs to be changed to Leftovers. Sash is useless on it.
Make your changes and test it on wifi. Then come back if anything else needs to be ironed out.
One more thing. Your team is also terribly weak against Trick Room, because it's so reliant on speed. Unfortunately that's the curse of rain teams, they're all speed-based. There's no easy answer for this particular problem.
Terriermon and Lopmon

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