In the poll I meant to rate it out of 5. Not 1/5. Rate it whatever you think is appropriate! Thanks!
The team at a glance:
The main idea of the team is to hurt the opponent as badly as I can while trying to sustain minimal damage myself through my resistances. Every weakness that a Pokemon has is resisted by another Pokemon which will make it hard for the opponent to hurt me while they suffer from residual damage from stealth rock as well as direct damage from my more offensive Pokemon. If I see an opening in the late game, I can send Salamence in and dragon dance before sweeping the opponent's weakened team. I know that Magnezone is usually included on teams based around a dragon sweep, but in this case I felt that there wasn't really any Pokemon I could take out in place of it.
I have noticed a huge Mamoswine Weakness (only Vaporeon isn't weak to either STAB move), but I see it so rarely now that I don't even know if it is worth switching a Pokemon on my team for a reliable counter. If I had to, I suppose switching my lead to Bronzong would be the best way to counter it, but I don't think it is worth it.
And a more detailed look:
Breloom @ Choice Scarf
Jolly
Poison Heal
4 HP / 252 Atk / 252 Spe
-Spore
-Mach Punch
-Stone Edge
-Superpower
Most people are surprised when they see this without Poison Heal. Scarf Breloom seems to cripple most common leads. Almost anything except for Ninjask or Lum Berry users will be crippled by this set. The basic idea is to put their lead to sleep, then switch over to Metagross who can usually set up rocks against whoever the switch-in is. Breloom can then come in later to get some revenge kills and maybe even sweep late in the game if it needs to. I almost always disable the opponent's lead while preventing them from using Stealth Rock, and I can come in later for some revenge kills. I am amazed that I don't see this more often as it counters nearly every common lead. I also love to see all of the trick users try to trick a choice scarf on to me. Mach Punch is for SD Luke who has been destroying my team.
Metagross @ Life Orb
Adamant
Clear Body
252 HP / 236 Atk / 12 Def / 8 Spe
-Meteor Mash
-Stealth Rock
-Earthquake
-Explosion
Metagross comes in after Breloom and usually sets up stealth rock unless it is a very bad match-up in which case I either explode or switch out. After setting up rocks, it either switches out so I can switch into outrages later in the game or it explodes. I am using a life orb because it doesn't need to worry about status most of the time because the nobody switches a status inducer into a Breloom so a lum berry would be near useless and this usually doesn't survive more than a few turns. It also boosts explosion while suffering no recoil from the move.
Vaporeon @ Leftovers
Bold
Water Absorb
188 HP / 252 Def / 68 Spe
-Surf
-HP Electric
-Roar
-Wish
Good old Vapreon... It helps me take on a lot of big threats. Most notably, it provides wish support to the likes of Heatran and Metagross. It also roars away those annoying Ninjask leads who Breloom can't handle. It also switch into most Infernape and can also can scare away dragon with the risk of an Ice Beam. When I am up against something that is obviously going to switch, I can use Roar so their counter is forced to switch out and I pick up some SR damage. This is the standard Wish set with Roar thrown on over Protect, but I think that it is worth it in this case.
Heatran @ Leftovers
Timid
Flash Fire
4 HP / 252 SpA / 252 Spe
-Substitute
-Fire Blast
-Toxic
-Earth Power
Heatran's ice 4x ice resistance is a great asset to my team (which has 3 ice weaknesses). The resistance to dragon moves can also save me. It can come in on something that will switch as it sets up the sub then proceed to hit it with either Fire Blast or Earth Power. If neither of the moves would be effective, then I toxic as they break the sub and switch to Celebi who covers all of Heatran's weaknesses and can probably outstall the opponent with recover.
Celebi @ Leftovers
Bold
Natural Cure
252 HP / 220 Def / 36 Spe
-Leech Seed
-Grass Knot
-HP Fire
-Recover
Celebi saves my team so many times in one game it is crazy. Heatran and Celebi work perfectly, with one's weaknesses being the other's resistances, I can get lots of switches on the opponent's side while I get some stealth rock damage and seed bulky opponents, HP Fire helps me alot with grasses and steels, and Grass Knot just about anything else. Recover is obviously for recovery. The main problem I encounter with Celebi is that it is that Salamence can come in on it and proceed to DD a few times then sweep if Suicune is already down. Meanwhile all I can do is seed it and watch it wear down slowly with leech seed + life orb recoil and that usually takes down at least Celeb as I don't have any reliable switch-ins to a +1 speed Salamence.
Salamence @ Life Orb
Naive
Intimidate
232 Atk / 24 SpA / 252 Spe
-Dragon Dance
-Fire Blast
-Outrage
-Earthquake
Salamence can sweep a weakened team very easily after a dragon dance. It comes in on a resisted attack or ground attack, the dragon dances before proceeding to finish off the opponent. Outrage is for pure power and STAB. Earthquake takes care of most things that resist outrage and Fire Blast takes down Forretress, Scizor, and Skarmory just to name a few. It also holds a few key resistances on my team and is my only ground immunity.
The team at a glance:






The main idea of the team is to hurt the opponent as badly as I can while trying to sustain minimal damage myself through my resistances. Every weakness that a Pokemon has is resisted by another Pokemon which will make it hard for the opponent to hurt me while they suffer from residual damage from stealth rock as well as direct damage from my more offensive Pokemon. If I see an opening in the late game, I can send Salamence in and dragon dance before sweeping the opponent's weakened team. I know that Magnezone is usually included on teams based around a dragon sweep, but in this case I felt that there wasn't really any Pokemon I could take out in place of it.
I have noticed a huge Mamoswine Weakness (only Vaporeon isn't weak to either STAB move), but I see it so rarely now that I don't even know if it is worth switching a Pokemon on my team for a reliable counter. If I had to, I suppose switching my lead to Bronzong would be the best way to counter it, but I don't think it is worth it.
And a more detailed look:

Breloom @ Choice Scarf
Jolly
Poison Heal
4 HP / 252 Atk / 252 Spe
-Spore
-Mach Punch
-Stone Edge
-Superpower
Most people are surprised when they see this without Poison Heal. Scarf Breloom seems to cripple most common leads. Almost anything except for Ninjask or Lum Berry users will be crippled by this set. The basic idea is to put their lead to sleep, then switch over to Metagross who can usually set up rocks against whoever the switch-in is. Breloom can then come in later to get some revenge kills and maybe even sweep late in the game if it needs to. I almost always disable the opponent's lead while preventing them from using Stealth Rock, and I can come in later for some revenge kills. I am amazed that I don't see this more often as it counters nearly every common lead. I also love to see all of the trick users try to trick a choice scarf on to me. Mach Punch is for SD Luke who has been destroying my team.

Metagross @ Life Orb
Adamant
Clear Body
252 HP / 236 Atk / 12 Def / 8 Spe
-Meteor Mash
-Stealth Rock
-Earthquake
-Explosion
Metagross comes in after Breloom and usually sets up stealth rock unless it is a very bad match-up in which case I either explode or switch out. After setting up rocks, it either switches out so I can switch into outrages later in the game or it explodes. I am using a life orb because it doesn't need to worry about status most of the time because the nobody switches a status inducer into a Breloom so a lum berry would be near useless and this usually doesn't survive more than a few turns. It also boosts explosion while suffering no recoil from the move.

Vaporeon @ Leftovers
Bold
Water Absorb
188 HP / 252 Def / 68 Spe
-Surf
-HP Electric
-Roar
-Wish
Good old Vapreon... It helps me take on a lot of big threats. Most notably, it provides wish support to the likes of Heatran and Metagross. It also roars away those annoying Ninjask leads who Breloom can't handle. It also switch into most Infernape and can also can scare away dragon with the risk of an Ice Beam. When I am up against something that is obviously going to switch, I can use Roar so their counter is forced to switch out and I pick up some SR damage. This is the standard Wish set with Roar thrown on over Protect, but I think that it is worth it in this case.

Heatran @ Leftovers
Timid
Flash Fire
4 HP / 252 SpA / 252 Spe
-Substitute
-Fire Blast
-Toxic
-Earth Power
Heatran's ice 4x ice resistance is a great asset to my team (which has 3 ice weaknesses). The resistance to dragon moves can also save me. It can come in on something that will switch as it sets up the sub then proceed to hit it with either Fire Blast or Earth Power. If neither of the moves would be effective, then I toxic as they break the sub and switch to Celebi who covers all of Heatran's weaknesses and can probably outstall the opponent with recover.

Celebi @ Leftovers
Bold
Natural Cure
252 HP / 220 Def / 36 Spe
-Leech Seed
-Grass Knot
-HP Fire
-Recover
Celebi saves my team so many times in one game it is crazy. Heatran and Celebi work perfectly, with one's weaknesses being the other's resistances, I can get lots of switches on the opponent's side while I get some stealth rock damage and seed bulky opponents, HP Fire helps me alot with grasses and steels, and Grass Knot just about anything else. Recover is obviously for recovery. The main problem I encounter with Celebi is that it is that Salamence can come in on it and proceed to DD a few times then sweep if Suicune is already down. Meanwhile all I can do is seed it and watch it wear down slowly with leech seed + life orb recoil and that usually takes down at least Celeb as I don't have any reliable switch-ins to a +1 speed Salamence.

Salamence @ Life Orb
Naive
Intimidate
232 Atk / 24 SpA / 252 Spe
-Dragon Dance
-Fire Blast
-Outrage
-Earthquake
Salamence can sweep a weakened team very easily after a dragon dance. It comes in on a resisted attack or ground attack, the dragon dances before proceeding to finish off the opponent. Outrage is for pure power and STAB. Earthquake takes care of most things that resist outrage and Fire Blast takes down Forretress, Scizor, and Skarmory just to name a few. It also holds a few key resistances on my team and is my only ground immunity.