This is a true OU team I am thinking about using. On Paper I think it sounds good, and each piece of the puzzle that makes this team up is not only viable but impressive. The hope of this team is to be able to balance the needs of both offense and defense without leaning too heavily on one or the other. Its uses a combination of speed, power, and crafty defense to shut down opponents.
1: The Defensive Spinner: Forretress
Let's face it Forretress has been doing this job for years. It comes in set-ups some hazards and then spin away those used by the opponent. On this team he is asked to do no different. He keeps up the pressure against certain counters with his Earthquake attack which may not actually kill anything, but can dent certain opponents. This is of course after layers Spikes and toxic Spikes.
Nature: Relaxed
EVs: 252 Hp, 200 Defense, 56 Special Defense
Moves: Spikes, Toxic Spikes, Earthquake, Rapid Spin
Item: Leftovers
Ability: Sturdy
2: The Special Wall: Virizion
While I know a lot of people look at this pokemon to attack and set-up, I don't. Virizion's job on this team is to use Toxic and wall special attacks. Now that doesn't mean I didn't want this pokemon to attack at all, that is not the case. Virizion packs Giga Drain for life recovery and Focus Blast to deal what she must. Roar can be used on her to help send those trying to setup on Virizion away, or one could use Calm Mind to start raising her Special Stats and perhaps slowly try to set up as well.
Nature: Calm
EVs: 252 Hp, 252 Special Defense, 4 Special Attack
Moves: Toxic, Roar, Giga Drain, Focus Blast
Item: Shell Bell
Ability: Justified
3. The Revenge Killer: Metagross
This pokemon oozes power, defense, and with its lovely accessory, Speed. Metagross resists one of the most popular entry hazards in Stealth Rock, is Immune to Toxic Spikes, and cannot have its stats lowered. All this means, is that Metagross is perfect to come in and clean up a weakened opponent that made the mistake of taking down one of Metagross' friends. As with any great Revenge Killer, Coverage is a must and Metagross covers it with 4 Solid Moves.
Nature: Adamant
EVs: 252 Atk, 252 Speed, 4 Hp
Moves: Earthquake, Meteor Mash, Pursuit, Zen Headbutt
Item: Choice Scarf
Ability: Clear Body
4: The Physical Force: Haxorus
This Pokemon is an absolute Force to be reckoned with. Power, Decent Bulk, manageble speed, its looks good on Paper. And on the field of battle, the facts cannot be disputed, Haxorus rips teams apart. For me, Dragon Dance is the Boosting move of Choice. This raises Speed and allows my axe face dragon the ability to grind opponents to dust. Outrage and Earthquake are the Power Spot selections. Brick Break filling a need to rip open little Ice type Pokemon that think they have what it takes. Haxorus on this team has but one simple job, Destroy.
Nature: Adamant
EVs: 252 Atk, 252 Speed, 4 Hp
Moves: Earthquake, Outrage, Brick Break, Dragon Dance
Item: Expert Belt
Ability: Mold Breaker
5. The Jedi (Special Attacker): Gengar
Gengar is on this team for two Reasons. One to represent the First Gen of Pokemon, and two and more importantly, to bring a Special Attack beat as only a true ghost can. So let's break it down. Shadow Ball is stab and delivers huge amounts of Damage coming off Gengar's Special Attack. Thunderbolt gives Coverage and hits a large number of Water Pokemon for massive Damage. Focus Blast makes Steel and Rock types into dust. And finally Venoshock is a little treat for any pokemon that ran into Toxic Spikes or Toxic from Gengar's buddies.
Nature: Timid
EVs: 252 Special Attack, 252 Speed, 4 Hp
Moves: Venoshock, Shadow Ball, Thunderbolt, Focus Blast
Item: Choice Specs
Ability: Levitate
6. The Mixer: Infernape
My favorite Starter stands tall here with powerful allies. But don't for think for a second he doesn't hold his own. Speed, Power, and Versatile moves, He is designed to do one thing, punch holes and help allies set up. That Fire Type giving issues Virizion, Here comes Infernape. That Steel Type making life hard Gengar? Leave it to Infernape. Defensive Pokemon have to fear the arrival of Infernape because he has the ability to put a hurting on Walls.
Nature: Hasty
EVs: 252 Attack, 252 Speed, 4 Special Attack
Moves: Overheat, Close Combat, Stone Edge, U-Turn
Item: Life Orb
Ability: Blaze (Though I would more than change this up a bit if Iron Fist was available.)
So all in all you have had a look at my team. Its doesn't depend on Weather, which I guess could come back to hurt it. However, each part of the Puzzle can handle its own in any given situation. The key is balance, and that is what I aimed for. I had thought about using Terrakion, but decided I preferred Metagross in the roll of Revenge Killer. Lucarion was another possible Mixed Threat, but I don't need Four Pokemon Weak to Fire.
Anyway, feel free to offer advice and suggestions. And I hope you like the basic ideal of the team so far.

1: The Defensive Spinner: Forretress
Let's face it Forretress has been doing this job for years. It comes in set-ups some hazards and then spin away those used by the opponent. On this team he is asked to do no different. He keeps up the pressure against certain counters with his Earthquake attack which may not actually kill anything, but can dent certain opponents. This is of course after layers Spikes and toxic Spikes.
Nature: Relaxed
EVs: 252 Hp, 200 Defense, 56 Special Defense
Moves: Spikes, Toxic Spikes, Earthquake, Rapid Spin
Item: Leftovers
Ability: Sturdy

2: The Special Wall: Virizion
While I know a lot of people look at this pokemon to attack and set-up, I don't. Virizion's job on this team is to use Toxic and wall special attacks. Now that doesn't mean I didn't want this pokemon to attack at all, that is not the case. Virizion packs Giga Drain for life recovery and Focus Blast to deal what she must. Roar can be used on her to help send those trying to setup on Virizion away, or one could use Calm Mind to start raising her Special Stats and perhaps slowly try to set up as well.
Nature: Calm
EVs: 252 Hp, 252 Special Defense, 4 Special Attack
Moves: Toxic, Roar, Giga Drain, Focus Blast
Item: Shell Bell
Ability: Justified

3. The Revenge Killer: Metagross
This pokemon oozes power, defense, and with its lovely accessory, Speed. Metagross resists one of the most popular entry hazards in Stealth Rock, is Immune to Toxic Spikes, and cannot have its stats lowered. All this means, is that Metagross is perfect to come in and clean up a weakened opponent that made the mistake of taking down one of Metagross' friends. As with any great Revenge Killer, Coverage is a must and Metagross covers it with 4 Solid Moves.
Nature: Adamant
EVs: 252 Atk, 252 Speed, 4 Hp
Moves: Earthquake, Meteor Mash, Pursuit, Zen Headbutt
Item: Choice Scarf
Ability: Clear Body

4: The Physical Force: Haxorus
This Pokemon is an absolute Force to be reckoned with. Power, Decent Bulk, manageble speed, its looks good on Paper. And on the field of battle, the facts cannot be disputed, Haxorus rips teams apart. For me, Dragon Dance is the Boosting move of Choice. This raises Speed and allows my axe face dragon the ability to grind opponents to dust. Outrage and Earthquake are the Power Spot selections. Brick Break filling a need to rip open little Ice type Pokemon that think they have what it takes. Haxorus on this team has but one simple job, Destroy.
Nature: Adamant
EVs: 252 Atk, 252 Speed, 4 Hp
Moves: Earthquake, Outrage, Brick Break, Dragon Dance
Item: Expert Belt
Ability: Mold Breaker

5. The Jedi (Special Attacker): Gengar
Gengar is on this team for two Reasons. One to represent the First Gen of Pokemon, and two and more importantly, to bring a Special Attack beat as only a true ghost can. So let's break it down. Shadow Ball is stab and delivers huge amounts of Damage coming off Gengar's Special Attack. Thunderbolt gives Coverage and hits a large number of Water Pokemon for massive Damage. Focus Blast makes Steel and Rock types into dust. And finally Venoshock is a little treat for any pokemon that ran into Toxic Spikes or Toxic from Gengar's buddies.
Nature: Timid
EVs: 252 Special Attack, 252 Speed, 4 Hp
Moves: Venoshock, Shadow Ball, Thunderbolt, Focus Blast
Item: Choice Specs
Ability: Levitate

6. The Mixer: Infernape
My favorite Starter stands tall here with powerful allies. But don't for think for a second he doesn't hold his own. Speed, Power, and Versatile moves, He is designed to do one thing, punch holes and help allies set up. That Fire Type giving issues Virizion, Here comes Infernape. That Steel Type making life hard Gengar? Leave it to Infernape. Defensive Pokemon have to fear the arrival of Infernape because he has the ability to put a hurting on Walls.
Nature: Hasty
EVs: 252 Attack, 252 Speed, 4 Special Attack
Moves: Overheat, Close Combat, Stone Edge, U-Turn
Item: Life Orb
Ability: Blaze (Though I would more than change this up a bit if Iron Fist was available.)
So all in all you have had a look at my team. Its doesn't depend on Weather, which I guess could come back to hurt it. However, each part of the Puzzle can handle its own in any given situation. The key is balance, and that is what I aimed for. I had thought about using Terrakion, but decided I preferred Metagross in the roll of Revenge Killer. Lucarion was another possible Mixed Threat, but I don't need Four Pokemon Weak to Fire.
Anyway, feel free to offer advice and suggestions. And I hope you like the basic ideal of the team so far.