Changes in bold underline.
So here it is at a glance:
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In depth:
The lead

Heatran - Schuca Berry
Flash Fire
Naive
EVs: 4 HP / 252 SpA / 252 Spe
~ Stealth Rock
~ Fire Blast
~ Earth Power
~ Explosion
Flash Fire
Naive
EVs: 4 HP / 252 SpA / 252 Spe
~ Stealth Rock
~ Fire Blast
~ Earth Power
~ Explosion
Heatran is my teams lead. First it uses Stealth Rock. It can survive one ground hit because of the Schuca Berry. If theres a Earthquaking Swampert, i use Explosion to get rid of it. Fire Blast(and Earth Power) is for Steel leads. Earth Power hits other Heatrans hard, cuz Hetrans are four time weak to Ground.
The tank
Dusknoir - Leftovers
Pressure
Impish
EVs: 252 HP / 252 Atk / 6 SpD
~ Will-O-Wisp
~ Fire Punch
~ ThunderPunch
~ Shadow Sneak

Dusknoir - Leftovers
Pressure
Impish
EVs: 252 HP / 252 Atk / 6 SpD
~ Will-O-Wisp
~ Fire Punch
~ ThunderPunch
~ Shadow Sneak
Dusknoir is my teams Tank. Will-O-Wisp for burn support. Fire Punch is actually for Weaviles and Skarmories. ThunderPunch for type coverage and does damage for Gyara's. Shadow Sneak for revenge kills. It is good because it always hits first, even Dusknoir has crappy Speed stat. It also absorbs fighting attacks they are meant to Snorlax and Porygon-Z.
Edits: ThunderPunch -> Ice Punch
The Nasty Sweeper
Togekiss - Lum Berry
Serene Grace
Modest
EVs: 252 HP / 152 SpA / 104 Spe
~ Nasty Plot
~ Roost
~ Aura Sphere
~ Air Slash

Togekiss - Lum Berry
Serene Grace
Modest
EVs: 252 HP / 152 SpA / 104 Spe
~ Nasty Plot
~ Roost
~ Aura Sphere
~ Air Slash
Here is my Nasty Plot Sweeper, Togekiss. With Serene Grace, Air Slash has more better flinch rate, it is now 60 % ! Nasty Plot boosts already good Special Attack, and after three Nasty Plots, Aura Sphere and Air Slash are awesome. If the health is low while Nasty Plotting, it uses Roost to recover HP. Aura Sphere is good against Tyranitars.
The Curser
Snorlax - Leftovers
Thick Fat
Careful
EVs: 168 HP / 120 Def / 220 SpD
~ Curse
~ Earthquake
~ Rest
~ Crunch

Snorlax - Leftovers
Thick Fat
Careful
EVs: 168 HP / 120 Def / 220 SpD
~ Curse
~ Earthquake
~ Rest
~ Crunch
Curselax's role is simple: it Curses few times and if HP is low, it Rests. It is still hard to take down, thanks for defensive EVs and Leftovers. Crunch is for hitting Ghosts,Levitaters and Flyers. Earthquake is for dealing some damage to foes poké. This could be good switch in, cuz it can take Ice attacks for Togekiss very well, because Thick Fat reduces Ice and Fire damage 50%.
Edits: Crunch ->Yawn
Edits: Crunch ->Yawn
The Team supporter

Jolteon - Leftovers
Volt Absorb
Timid
EVs: 56 HP / 200 SpA / 252 Spe
~ Substitute
~ Baton Pass
~ Charge Beam
~ Wish
Jolteon is my teams Substitute and Wish Passer. It has very good speed after it has Timid nature and 252 Speed EV, so it can overspeed well. It makes a Sub for Curselax or Porygon-Z with Baton Pass. Wish is for healing other pokés in my team, if they are in pinch. Charge Beam is 45% weaker than Thunderbolt, but if it gets SpA boost, it can be stronger every turn, because its Special Attack. Jolteon absorbs electric attacks for Togekiss and gains some health.
Edits: Charge Beam -> T-Bolt, Wish -> Shadow BallThe Lategame Sweeper

Porygon-Z - Choice Specs
Adaptability
Modest
EVs: 4 Def / 252 SpA / 252 Spe
~ Tri Attack
~ Thunderbolt
~ Ice Beam
~ Hidden Power [ Fight ]
And last but not least, my Lategame Sweeper, Porygon-Z. Thunderbolt and Ice Beam work well on Choice Specs set, they are boosted by 30%. Porygon-Z's SpA goes to 607, thanks for the Specs. And all of its attack are Specials. Tri Attack for reliable STAB move, hitting hard almost everything except Ghosts,Rocks,Steels etc. Thunderbolt for those bulky Gyarados's and Ice Beam to deal with those popular DDMences. HP Fight hits Tyranitars and Heatrans hard.
And now its ready for rating..