Alrighty, I just checked. Here's my team in White II:

1.) Vaporeon - Surf, Shadow Ball, Hydro Pump, Ice Beam.
Nature: Rash (Meh... at least Special Atk. is up)

2.) Espeon - Morning Sun, Toxic, Psychic, Shadow Ball.
Nature: Bold (Meh again. At least she is "Very finicky", though.)

3.) Flygon - Earth Power, Hyper Beam, Dragon Pulse, Fly.
Nature: Quiet (Good enough, I wanted a Special Atk. Flygon.)

4.) Lucario - Dark Pulse, Dragon Pulse, Aura Sphere, Ice Punch.
Nature: Careful (NOOOOOO!!!!!... At least she is "Highly Curious.")

5.) Arcanine - Flamethrower, Strength, Dig, Thunder Fang. I hate the moves I have for her...
Nature: Mild. (Pretty good.)

I quite clearly don't play competitively. I also don't seem to have any Gen V Pokemon.

I don't have a specific team per se, but I generally work with a fire, ghost, earth and dragon. The other two slots are usually filled by water, grass and/or flying.

I rotate some pokemons, but I must have milotic, that thing is a great wall.
I'll post a complete team later.

My gen IV team: Miltank,Dragonite, Swampert,Raichu,Shuckle,Alakazam. Alakazam is a SP.ATK beast!!

Swampert
Gardevoir
Hariyama
Manectric
Salamence
Metagross

3rd gen pkmn

My teams:

R/B/G:
Blastoise
Primeape
Pidgeot
Mewtwo
Golem
Arcanine

G/S/C:
Feraligatr
Golem
Arcanine
Pidgeot
Victreebel
Raiku

R/S/E:
Marshtomp
Absol
Groudon
Swellow
Machamp
Nosepass

(Haven't played D/P/P :( )

B/W:
I forgot their names...
The Water one, the electric zebra, the black/white bird, the blue fighting muppet, ... forgot that quick... I miss the old Pokemon:(

I haven't battled in a while, but Volcarona was used a lot in OU singles. Quiver Dance is so OP. It's biggest weakness though that it takes 50% from Stealth Rock which is basically in every competitive team.

I don't remember my whole team but what I remember is:

Gyarados: Adamant nature and full Speed/Attack IV's. I got reaaally lucky with this one. It had Intimidate though I wish it was Moxie. 

Waterfall

Dragon Dance

Subsitute

Bounce

Ferrothorn: 

Leech Seed

Spikes

Gyro Ball

Power whip

Volcarona:

Quiver Dance

Fiery Dance

Fire Blast

Bug Buzz

Terrakion:

Stone Edge

Close Combat

Forgot the rest.

Definitely one of the cooler Bug Pokemon along with Scizor of course.

I have only played Ruby seriously. I'm a battle tower guy, so I only plan teams of 3 pokemon. My favourite is (and I know the moves by heart):

1. Skarmory:

Toxic
Spikes
Drill peck
Roar
@Leftovers

2. Latias (Speed and SA EV's)
Safeguard
Calm mind
Dragon claw
Recover
@Dragon fang

3. Latios (Speed and SA EV's)
Calm mind
Thunderbolt
Ice beam
Recover

Currently on a 1350 LvL 100 streak.

lol what a cheap team, must be a beasting Latios and Latias