Ok, let's get started. My team is for standard battles, but it needs a lot of work. Let's list the pokemon and go from there.
Lead and Fast Special Sweeper
Nature: Hasty
IVs: 24/27/21/30/31/31
EVs: 252 SA/252 S/6 HP
HP: Grass 66
Item: Choice Scarf
Moves: Eruption, Lava Plume, Hidden Power, Focus blast
Strategy:
There for revenge fast special sweeping, Eruption is powerfull STAB at max BP of 225, this hurts even Dragons. Lava Plume is to be used when your HP is to low for Eruption, but you need STAB, also a 30% chance of burn is nice. Hidden Power to clean up Water pokemon. Focus Blast KOs Heatran, T-tar, and really puts a dent in Blissey. I could add attack EVs and add EQ or something, but I don't really like Mixphlosion. I really don't like Focus Punch's reliance on them switching.
Physical Wall and Support
nature: relaxed
ivs: 31/31/31/31/31/31
evs: 252 HP | 112 Atk. | 144 Def
Item: Leftovers
Moves: Toxic Spikes, EQ, Rapid Spin, Explosion
Strategy.
Don't see many of these around, set up the toxic spikes, then switch to something else. Come in on a Physical attacker to make them switch since you can take a hit, then EQ while they switch. Explosion is also very good for KOing something like Gyarados if they've gotten to many stat boosts. Rapid Spin to clear away entry hazards. The steel lets him come in on Toxic Spikes without getting poisoned.
Physical Attacker
Nature: Jolly
IVs: 15/31/30/31/27/31
EVs: 252 A/252 S/ 6 HP
Item: Light Ball
Moves: Encore, Brick Break, Fake Out, Volt Tackle
Strategy:
Fake Out is auto flinch, breaking Sashes and sometimes inflicting quite a bit of damage. Volt Tackle is some of the only STAB Pikachu gets for physical, BB takes out Weavile and T-tar and Encore can get a Blissey stuck on T-wave or some other support move, or a lead on SR, something like that.
Physical Attacker
Nature:Adamant
IV's: 31/31/31/x/31/31
EV's: 216 HP/16 Atk/176 Def/100 Spe
Moves: Taunt/Dragon Dance/Aqua Tail/Ice Fang
Item: Life Orb
Strategy:
DD up, then sweep. Ice Fang for dragons and grass pokemon, Waterfall for STAB, and taunt for pseudo hazers/status inflicters. Nothing special.
Support
Nature: Bold
Ability: Natural Cure
IVs 29/x/31/31/30/30
EVs: 255HP/255DEF
Moves: T-wave, Soft Boiled, Aromatherapy, Seismic Toss
Strategy:
T-wave annoying pokemon who you need to out speed, Soft Boiled for recovery, Aromatherapy for getting rid of Burn, Poison, Sleep and Paralyzation and Seismic Toss for damage. Natural Cure allows switching in to Toxic, Hypnosis, WoW and T-wave without fear, also not letting your opponent use another sleep move until they know that it has Natural Cure.
Special Attacker and Hazer
Nature: Bold
IVs:31/31/30/31/31/31
EVs: Need a spread
Moves:
~Ice Beam
~Surf
~Wish
~Haze
Strategy:
Come in on Dragons and scare them away with the threat of Ice beam, Surf for STAB and accuracy, Wish for healing and support. Haze is for the CM, DD and NP pokemon who think that they can get away with it when you send Vaporeon out, or for when you send him in against something that got to many.
Clauses:
~Hax items Clause
~Evasion clause
~Sleep Clause.
~Species Clause
~OHKO Moves Clause
Well, that's it. Suggestions, changes, additions and all that stuff are greatly appreciated.
Lead and Fast Special Sweeper

Nature: Hasty
IVs: 24/27/21/30/31/31
EVs: 252 SA/252 S/6 HP
HP: Grass 66
Item: Choice Scarf
Moves: Eruption, Lava Plume, Hidden Power, Focus blast
Strategy:
There for revenge fast special sweeping, Eruption is powerfull STAB at max BP of 225, this hurts even Dragons. Lava Plume is to be used when your HP is to low for Eruption, but you need STAB, also a 30% chance of burn is nice. Hidden Power to clean up Water pokemon. Focus Blast KOs Heatran, T-tar, and really puts a dent in Blissey. I could add attack EVs and add EQ or something, but I don't really like Mixphlosion. I really don't like Focus Punch's reliance on them switching.
Physical Wall and Support

nature: relaxed
ivs: 31/31/31/31/31/31
evs: 252 HP | 112 Atk. | 144 Def
Item: Leftovers
Moves: Toxic Spikes, EQ, Rapid Spin, Explosion
Strategy.
Don't see many of these around, set up the toxic spikes, then switch to something else. Come in on a Physical attacker to make them switch since you can take a hit, then EQ while they switch. Explosion is also very good for KOing something like Gyarados if they've gotten to many stat boosts. Rapid Spin to clear away entry hazards. The steel lets him come in on Toxic Spikes without getting poisoned.
Physical Attacker

Nature: Jolly
IVs: 15/31/30/31/27/31
EVs: 252 A/252 S/ 6 HP
Item: Light Ball
Moves: Encore, Brick Break, Fake Out, Volt Tackle
Strategy:
Fake Out is auto flinch, breaking Sashes and sometimes inflicting quite a bit of damage. Volt Tackle is some of the only STAB Pikachu gets for physical, BB takes out Weavile and T-tar and Encore can get a Blissey stuck on T-wave or some other support move, or a lead on SR, something like that.
Physical Attacker

Nature:Adamant
IV's: 31/31/31/x/31/31
EV's: 216 HP/16 Atk/176 Def/100 Spe
Moves: Taunt/Dragon Dance/Aqua Tail/Ice Fang
Item: Life Orb
Strategy:
DD up, then sweep. Ice Fang for dragons and grass pokemon, Waterfall for STAB, and taunt for pseudo hazers/status inflicters. Nothing special.
Support

Nature: Bold
Ability: Natural Cure
IVs 29/x/31/31/30/30
EVs: 255HP/255DEF
Moves: T-wave, Soft Boiled, Aromatherapy, Seismic Toss
Strategy:
T-wave annoying pokemon who you need to out speed, Soft Boiled for recovery, Aromatherapy for getting rid of Burn, Poison, Sleep and Paralyzation and Seismic Toss for damage. Natural Cure allows switching in to Toxic, Hypnosis, WoW and T-wave without fear, also not letting your opponent use another sleep move until they know that it has Natural Cure.
Special Attacker and Hazer

Nature: Bold
IVs:31/31/30/31/31/31
EVs: Need a spread
Moves:
~Ice Beam
~Surf
~Wish
~Haze
Strategy:
Come in on Dragons and scare them away with the threat of Ice beam, Surf for STAB and accuracy, Wish for healing and support. Haze is for the CM, DD and NP pokemon who think that they can get away with it when you send Vaporeon out, or for when you send him in against something that got to many.
Clauses:
~Hax items Clause
~Evasion clause
~Sleep Clause.
~Species Clause
~OHKO Moves Clause
Well, that's it. Suggestions, changes, additions and all that stuff are greatly appreciated.