My first ever "OU" team that I made back in December consisted of a Glaceon, Infernape, Forretress, Lapras, Dragonite, and Venusaur. It was pitiful.
Since then I've come along quite a bit if I do say so, because I think I've got a pretty solid team here.
EDIT: Changes are in Bold.
Heatran @Shuca Berry
Ability: Flash Fire
252 Spd / 252 SpA / 4 HP
Modest (+SpA, -Atk)
~ Stealth Rock
~ Overheat
~ Explosion
~ Earth Power
Typical Suicide Lead. Generally gets shut down by the occasional Swampert lead, that's why I'm considering swapping out Toxic for HP Grass. I had Toxic for a while, to maybe snag a badly poison on something that decides to try and wall my Tornado. Then, afterwards, I explode.
Kingdra @Leftovers
Ability: Swift Swim
252 SpA / 252 HP / 4 HP
Modest (+SpA, -Atk)
~ Rain Dance (possibly Draco Meteor)
~ Surf
~ Dragon Pulse
~ Hidden Power Fire
Rain Dance is for the sole purpose of activating Kingdra's Swift Swim, making him an excellent late game sweeper. I haven't been competitive battling for long, but I can tell already that Scizor is very prevalent in today's metagame. That's why I decided on HP Fire, which eliminates those pesky bugs. However, the reason I'm thinking about changing Rain Dance into Something else, perhaps Draco Meteor, is because the rain hinders my fly-swatting capabilities.
Zapdos @Leftovers
Ability: Pressure
248 HP / 228 Def / 32 Spe
Serious (No effect)
~ Thunderbolt
~ Heat Wave
~ Hidden Power Grass
~ Roost
Serious nature? What? Yep, he isn't perfect. Definitely going to change that to a Calm, or a Timid. Zapdos makes an excellent counter to Swampert and Hippwodon, and other things that don't expect a HP Grass coming their way. Maybe I'll swap the EV's around a bit, but I like him, he tends to be a viable Roost staller, as well as a hard hitter.
Scizor @Life Orb
Ability: Technician
4 HP / 252 Atk / 252 Spd
Adamant (+Atk, -SpA)
~ Bullet Punch
~ X-Scissor
~ Superpower
~ Roost
All teams enjoy something as powerful as Scizor, so why not slap him on my team? I use X-Scissor over U-Turn because I like the extra power, and my Life Orb doesn't like me U-Turning and building up a plethora of residual damage.
Flygon @Choice Scarf
Ability: Levitate
4 HP / 252 Atk / 252 Spd
Adamant (+Atk, -SpA)
~ Outrage
~ Earthquake
~ Thunderpunch
~ U-Turn
He and Scizor can switch in pretty easily on each other's weaknesses, and a STAB Outrage does nice damage to almost everything but Skarmory. He has saved many battles for me, so I'm thankful he's there to rage.
Gengar @Life Orb
Ability: Levitate
252 SpA / 252 Spd / 4 HP
Modest (+SpA, -Atk)
~ Substitute
~ Explosion
~ Shadow Ball
~ Focus Blast
I have tried this Gengar over my Skarmory, and instead of just bringing in a Heatran, it actually gets some kills for me. Thanks Eggbert, for suggesting this!
Thanks in advance for the feedback!
Since then I've come along quite a bit if I do say so, because I think I've got a pretty solid team here.
EDIT: Changes are in Bold.

Heatran @Shuca Berry
Ability: Flash Fire
252 Spd / 252 SpA / 4 HP
Modest (+SpA, -Atk)
~ Stealth Rock
~ Overheat
~ Explosion
~ Earth Power
Typical Suicide Lead. Generally gets shut down by the occasional Swampert lead, that's why I'm considering swapping out Toxic for HP Grass. I had Toxic for a while, to maybe snag a badly poison on something that decides to try and wall my Tornado. Then, afterwards, I explode.

Kingdra @Leftovers
Ability: Swift Swim
252 SpA / 252 HP / 4 HP
Modest (+SpA, -Atk)
~ Rain Dance (possibly Draco Meteor)
~ Surf
~ Dragon Pulse
~ Hidden Power Fire
Rain Dance is for the sole purpose of activating Kingdra's Swift Swim, making him an excellent late game sweeper. I haven't been competitive battling for long, but I can tell already that Scizor is very prevalent in today's metagame. That's why I decided on HP Fire, which eliminates those pesky bugs. However, the reason I'm thinking about changing Rain Dance into Something else, perhaps Draco Meteor, is because the rain hinders my fly-swatting capabilities.

Zapdos @Leftovers
Ability: Pressure
248 HP / 228 Def / 32 Spe
Serious (No effect)
~ Thunderbolt
~ Heat Wave
~ Hidden Power Grass
~ Roost
Serious nature? What? Yep, he isn't perfect. Definitely going to change that to a Calm, or a Timid. Zapdos makes an excellent counter to Swampert and Hippwodon, and other things that don't expect a HP Grass coming their way. Maybe I'll swap the EV's around a bit, but I like him, he tends to be a viable Roost staller, as well as a hard hitter.

Scizor @Life Orb
Ability: Technician
4 HP / 252 Atk / 252 Spd
Adamant (+Atk, -SpA)
~ Bullet Punch
~ X-Scissor
~ Superpower
~ Roost
All teams enjoy something as powerful as Scizor, so why not slap him on my team? I use X-Scissor over U-Turn because I like the extra power, and my Life Orb doesn't like me U-Turning and building up a plethora of residual damage.

Flygon @Choice Scarf
Ability: Levitate
4 HP / 252 Atk / 252 Spd
Adamant (+Atk, -SpA)
~ Outrage
~ Earthquake
~ Thunderpunch
~ U-Turn
He and Scizor can switch in pretty easily on each other's weaknesses, and a STAB Outrage does nice damage to almost everything but Skarmory. He has saved many battles for me, so I'm thankful he's there to rage.

Gengar @Life Orb
Ability: Levitate
252 SpA / 252 Spd / 4 HP
Modest (+SpA, -Atk)
~ Substitute
~ Explosion
~ Shadow Ball
~ Focus Blast
I have tried this Gengar over my Skarmory, and instead of just bringing in a Heatran, it actually gets some kills for me. Thanks Eggbert, for suggesting this!
Thanks in advance for the feedback!