My favorite: Rain.

[YOOMTAH]

Introduction:
This is just a Rain Dance team... or is it? I consider every possible change.


First Look:

Team Building:
Obvious is obious. I want to work with Politoed. I am a fan of a suprise factor, so it's not going to be in a lead posision. Here's a little support set:

Politoed @ Choice Scarf | Drizzle
Timid | 252 Spe / 252 HP / 4 SpDef
Encore | Ice Beam | Toxic | Surf

Encore is always useful. Toxic is toxic. Ice Beam and Surf are attacking options, might think of using Perish Song later.​

And now I'll begin with a lead. I need something that draws attacks Politoed can get in on easily: Fire/Water/Ice/Steel attacks, TrickScarf, Set-up, Stealth Rock.
So, what makes an opponent do such things?
Fire/Water/Ice/Steel attacks: When it's supereffective.
TrickScarf: Bulky leads.
Set-up: As far as I am aware of, other set-up and bulky leads.
Stealth Rock: Everything that isn't Taunt.
Putting most things together, I can use this:

Erufuun @ Focus Sash | Mischievous Heart
Jolly | 252 Atk / 252 Spe / 4 HP
Taunt | Encore | U-turn | Tailwind

This lead gives me enough possibilities for Politoed to come in. Encore is for anything stupid enough to lay down rocks or setup, U-turn makes me switch to Politoed, and Tailwind ensures this switch and ensures Politoed/any other Pokémon can safely do something.​

And now, lets add a sweepers.

Tsunbeaa @ Life Orb | Swift Swim
Jolly | 252 Spe / 252 Atk / 4 HP
Icicle Drop | Brick Break | Night Slash | Rock Slide

Amazingness. This polarbear know what he's doing. Icicle Drop is a new 85 BP physical Ice attack, which gains STAB. Brick Break + Night Slash is unresisted coverage, and Rock Slide might come in handy for fire Pokémon.​

I want another sweeper.

Armaldo @ Life Orb | Swift Swim
Jolly | 252 Spe / 252 Atk / 4 HP
Rock Slide | Earthquake | X-Scissor | Knock Off

I love non-waterpokémon having Swift Swim. It makes sense. Rock Slide + Earthquake = almost unresisted coverage, with Rock Slide gaining STAB. X-Scissor is second STAB, Knock Off demolishes Chansey and other NFE's.​

Now, I'm lacking special power.

Vaporeon @ Leftovers | Hydration
Modest | 252 HP / 252 SpAtk / 4 SpDef
Surf | Ice Beam | HP [Electric] | Rest

Vaporeon gained such a good improvement. Most people seemed to forget this somehow because of all of the other good stuff in the 5th gen.
Surf is STAB, BoltBeam for coverage, Rest is... it's a filler!!!!​

And finally for coverage and using an underrated Pokémon who needs to get rated higher:

Lanturn @ Leftovers | Volt Absorb
Modest | 252 HP / 252 SpAtk / 4 SpDef
Ice Beam | Thunder | Thunder Wave | Surf

Lanturn is such a cool Pokémon. The famous Pokémon who resists BoltBeam uses BoltBeam itself very well. Especially with Thunder always hitting and having a BP of 180 factoring STAB. Thunder Wave is useful for being Thunder Wave. Surf is second STAB.​

Summary:

Erufuun @ Focus Sash
Mischievous Heart
Adamant nature, 252 Spe / 252 Atk / 4 HP
- Taunt
- Encore
- U-turn
- Tailwind

Politoed @ Choice Scarf
Drizzle
Timid nature, 252 Spe / 252 HP / 4 SpDef
- Encore
- Ice Beam
- Toxic
- Surf

Tsunbeaa @ Life Orb
Swift Stim
Jolly nature, 252 Spe / 252 Atk / 4 HP
- Icicle Drop
- Brick Break
- Night Slash
- Rock Slide

Armaldo @ Life Orb
Swift Swim
Jolly nature, 252 Spe / 252 Atk / 4 HP
- Rock Slide
- Earthquake
- X-Scissor
- Knock Off

Vaporeon @ Leftovers
Hydration
Modest nature, 252 HP / 252 SpAtk / 4 SpDef
- Surf
- Ice Beam
- HP [Electric]
- Rest

Lanturn @ Leftovers
Volt Absorb
Modest nature, 252 HP / 252 SpAtk / SpDef
- Ice Beam
- Thunder
- Thunder Wave
- Surf

Last Look:

 

[squishynz]

Tsunbeaa @ Life Orb | Swift Swim
Jolly | 252 Spe / 252 Atk / 4 HP
Icicle Drop | Brick Break | Night Slash | Rock Slide

Amazingness. This polarbear know what he's doing. Icicle Drop is a new 85 BP physical Ice attack, which gains STAB. Brick Break + Night Slash is unresisted coverage, and Rock Slide might come in handy for fire Pokémon.

Ghost/Fighting is the unresisted combo i am pretty sure. Not fighting/dark. However it does learn shadow claw which is the same thing just different type. Also Tsunbeaa learns superpower which may be an option although not good for prolonged sweeping.

Other than that looks pretty good.

Surprise factor sure is nice.

 

[YOOMTAH]

Ghost/Fighting is the unresisted combo i am pretty sure. Not fighting/dark. However it does learn shadow claw which is the same thing just different type. Also Tsunbeaa learns superpower which may be an option although not good for prolonged sweeping.

Other than that looks pretty good.

Surprise factor sure is nice.

Yeah Tsunbeaa is meant for prolonged sweeping, as this team can't afford to switch much. Ghost gives the same coverage as dark, and Night Slash has higher BP then Shadow Claw.

The team is not much interesting, it's more like trying the new stuff out. I'll update soon enough.

Anyone else with an opinion?