At a first glance:

Overview
The idea of this team is to let Gyarados be the main sweeper and let it take out as much as possible whilst Scizor, Latias, Heatran and Celebi clean up. With proper support from a Stealth Rock user and Rapid Spinner, such as Donphan, and the ability to cripple the opponent, whom both Latias and Celebi can do, it won’t be hard for Gyarados to find an opportunity to sweep.
The building process

I wanted Gyarados to be the main sweeper of the team, so here returns my favourite sweeper from gen 4; the Red Gyarados I like to call Onyxia.


Gyarados needs someone to keep entry on the opposing field, and off my field. Donphan, being able to lay Stealth Rock, use Rapid Spin, and additionally is immune to Electric that Gyarados hates, is a good choice

Scizor, the king of the metagame, is a huge asset as it can Revenge Kill anything that might have taken Gyarados down, or can U-Turn into something that Gyarados can set up on

Heatran works well with the rest of the team as it takes any Fire Attacks aimed at Scizor with a benefit, whilst Gyarados can take Ground and Water attacks aimed at Heatran

I thought that I could use something that hits hard and can tank Special Attacks at the same time. Latias fills that role....

Like Latias, Celebi also hits hard, but more importantly it can take care of any bulky waters that give this team trouble.
Then I realsed "Wow, 4/6 are Red. So why not call it the Red Team?!" If ONLY I had Shiny Donphan and Shiny Celebi....
Indepth

Donphan @ Leftovers
Ability: Sturdy
Nature: Impish
EVs: 252 HP/ 4 Atk/ 252 Def
- Stealth Rock
- Rapid Spin
- Earthquake
- Ice Shard
The main point of Donphan is to get Steath Rock out there. Next thing he needs to do is Rapid Spin should he need to. But Donphan is not limited to just that. Impish Nature, Max Def investment and naturally good Defence lets it take a hit from the likes of Dragonite, Landorus, Salamence and Swords Dance Gliscor and check them with prority Ice Shard. The upgrade to Sturdy means that Donphan won't have to worry about incoming Politoed's Hydro Pump because it will always survive. So nothing really can stop Donphan from getting Stealth Rock out there (except Taunt)

Gyarados @ Leftovers
Ability: Intimidate
Nature: Adamant
EVs: 156 HP/ 72 Atk/ 96 Def/ 176 Spe
- Dragon Dance
- Waterfall
- Taunt
- Stone Edge
Gyarados (also known as Onyxia to me) is the main sweeper of the team. Taunt allows Gyarados not to be stopped by defensive walls such as Skarmory, who could Whirlwind it away, Nattorei, who could Leech Seed or Thunder Wave, and Celebi, who is in the same boat as Nattorei. Stone Edge is used over Bounce becuase the team can generally handle Grass Types better than it can Flying Types.
Scizor @ Choice Band
Ability: Technician
Nature: Adamant
EVs: 248 hp/ 252 Atk/ 8 Spe
- Bullet Punch
- U-Turn
- Superpower
- Pursuit
Scizor functions as the teams revenge killer and scout. Bullet Punch, being boosted 3 times (Choice Band, STAB and Technician) is a deadly priority move that will hurt anything that doesn't resist it, but usually Scizor will be U-Turning. U-Turn is not only powerful, but it lets Scizor know what the opponent is doing so he can switch into an appropriate teammate, such as Gyarados, who can set up a sweep, Latias, who can hurt pretty much everything, or Heatran, who can come in on Fire Types. U-Turn is also handy for escaping Magnezone. Thanks to team preview, Scizor knows whether he should be Superpowering more often to catch Magnezone on the switch or not. Pusuit is to trap Ghost Types that get in the way of Donphan's Rapid Spinning.
Heatran @ Leftovers
Ability: Flash Fire
Nature: Timid
EVs: 4 HP/ 252 Atk/ 252 Spe
- Fire Blast
- Earth Power
- Substitute
- Toxic
I used this Heatran in gen 4 and it worked really well. The plan is to have Heatran switch in on a Fire Attack, or anything else that it resists. From there, the opponent will probably have to switch out, alowing Heatran time to get a Sub up. The next Pokemon will have to get around Heatran's sub to try and damage it whilst Heatran can choose the opponents doom with either a possibly boosted-Fire Blast, Earth Power, or Toxic to cripple bulky waters that keep running away from Celebi, hindering their usability. The EV spread is to give this Heatran sweeping potential, making it as fast and as powerful as possible, whilst it can take hits due to Substitute.
Latias @ Choice Specs
Ability: Levitate
Nature: Timid
EVs: 4 HP/ 252 SAtk/ 252 Spe
- Draco Meteor
- Dragon Pulse
- Surf
- Trick
Latias is chosen over Latios for this role becuase Latias can take Special Attacks better, which is important for the rest of the team. Latias still hits hard thanks to Choice Specs, and anything bar Steel-Types will not enjoy Draco Meteor coming from this thing. Dragon Pulse is if Latias needs to stay in for more than 1 turn to do constant damage. Surf will hit Tyranitar on the switch for a large chunk of damage, possibly 2HKOing. Trick is to cripple anything that says the word "defensive" or "boosting sweeper". If Latias manages to cripple something this way, Heatran can have a much easier time switching in and forcing switches.
Celebi @ Life Orb
Ability: Natural Cure
Nature: Modest
EVs: 232 HP/ 240 SAtk/ 36 Spe
- Leaf Storm
- Thunder Wave
- Earth Power
- Recover
Celebi was put on the team to take down Bulky Waters; severly damaging them with Leaf Storm, mostly OHKOing. Although the Tinkerbell set dosen't need support when handling Tyranitar, the team give Celebi that support just in case, as Donphan and Scizor is easily ake on Tyranitar. Thunder Wave will cripple anything non-Ground Type that is a threat, making Pokemon such as Salamence, Dragonite, Lati@s, Gyarados, Terrakion and Choice Scarf users almost useless. This will often force a switch, letting Celebi Recover any damage that it might have taken. As for Earth Power, well, to be honest, I though that I would never be lucky to get Hidden Power Fire on a Celebi, so Earth Power seemed the next best thing.
And that does it
Feedback, opinions, support, critacism, ect would be very, very helpful.






Overview
The idea of this team is to let Gyarados be the main sweeper and let it take out as much as possible whilst Scizor, Latias, Heatran and Celebi clean up. With proper support from a Stealth Rock user and Rapid Spinner, such as Donphan, and the ability to cripple the opponent, whom both Latias and Celebi can do, it won’t be hard for Gyarados to find an opportunity to sweep.
The building process

I wanted Gyarados to be the main sweeper of the team, so here returns my favourite sweeper from gen 4; the Red Gyarados I like to call Onyxia.


Gyarados needs someone to keep entry on the opposing field, and off my field. Donphan, being able to lay Stealth Rock, use Rapid Spin, and additionally is immune to Electric that Gyarados hates, is a good choice



Scizor, the king of the metagame, is a huge asset as it can Revenge Kill anything that might have taken Gyarados down, or can U-Turn into something that Gyarados can set up on




Heatran works well with the rest of the team as it takes any Fire Attacks aimed at Scizor with a benefit, whilst Gyarados can take Ground and Water attacks aimed at Heatran





I thought that I could use something that hits hard and can tank Special Attacks at the same time. Latias fills that role....






Like Latias, Celebi also hits hard, but more importantly it can take care of any bulky waters that give this team trouble.
Then I realsed "Wow, 4/6 are Red. So why not call it the Red Team?!" If ONLY I had Shiny Donphan and Shiny Celebi....
Indepth

Donphan @ Leftovers
Ability: Sturdy
Nature: Impish
EVs: 252 HP/ 4 Atk/ 252 Def
- Stealth Rock
- Rapid Spin
- Earthquake
- Ice Shard
The main point of Donphan is to get Steath Rock out there. Next thing he needs to do is Rapid Spin should he need to. But Donphan is not limited to just that. Impish Nature, Max Def investment and naturally good Defence lets it take a hit from the likes of Dragonite, Landorus, Salamence and Swords Dance Gliscor and check them with prority Ice Shard. The upgrade to Sturdy means that Donphan won't have to worry about incoming Politoed's Hydro Pump because it will always survive. So nothing really can stop Donphan from getting Stealth Rock out there (except Taunt)

Gyarados @ Leftovers
Ability: Intimidate
Nature: Adamant
EVs: 156 HP/ 72 Atk/ 96 Def/ 176 Spe
- Dragon Dance
- Waterfall
- Taunt
- Stone Edge
Gyarados (also known as Onyxia to me) is the main sweeper of the team. Taunt allows Gyarados not to be stopped by defensive walls such as Skarmory, who could Whirlwind it away, Nattorei, who could Leech Seed or Thunder Wave, and Celebi, who is in the same boat as Nattorei. Stone Edge is used over Bounce becuase the team can generally handle Grass Types better than it can Flying Types.

Scizor @ Choice Band
Ability: Technician
Nature: Adamant
EVs: 248 hp/ 252 Atk/ 8 Spe
- Bullet Punch
- U-Turn
- Superpower
- Pursuit
Scizor functions as the teams revenge killer and scout. Bullet Punch, being boosted 3 times (Choice Band, STAB and Technician) is a deadly priority move that will hurt anything that doesn't resist it, but usually Scizor will be U-Turning. U-Turn is not only powerful, but it lets Scizor know what the opponent is doing so he can switch into an appropriate teammate, such as Gyarados, who can set up a sweep, Latias, who can hurt pretty much everything, or Heatran, who can come in on Fire Types. U-Turn is also handy for escaping Magnezone. Thanks to team preview, Scizor knows whether he should be Superpowering more often to catch Magnezone on the switch or not. Pusuit is to trap Ghost Types that get in the way of Donphan's Rapid Spinning.

Heatran @ Leftovers
Ability: Flash Fire
Nature: Timid
EVs: 4 HP/ 252 Atk/ 252 Spe
- Fire Blast
- Earth Power
- Substitute
- Toxic
I used this Heatran in gen 4 and it worked really well. The plan is to have Heatran switch in on a Fire Attack, or anything else that it resists. From there, the opponent will probably have to switch out, alowing Heatran time to get a Sub up. The next Pokemon will have to get around Heatran's sub to try and damage it whilst Heatran can choose the opponents doom with either a possibly boosted-Fire Blast, Earth Power, or Toxic to cripple bulky waters that keep running away from Celebi, hindering their usability. The EV spread is to give this Heatran sweeping potential, making it as fast and as powerful as possible, whilst it can take hits due to Substitute.

Latias @ Choice Specs
Ability: Levitate
Nature: Timid
EVs: 4 HP/ 252 SAtk/ 252 Spe
- Draco Meteor
- Dragon Pulse
- Surf
- Trick
Latias is chosen over Latios for this role becuase Latias can take Special Attacks better, which is important for the rest of the team. Latias still hits hard thanks to Choice Specs, and anything bar Steel-Types will not enjoy Draco Meteor coming from this thing. Dragon Pulse is if Latias needs to stay in for more than 1 turn to do constant damage. Surf will hit Tyranitar on the switch for a large chunk of damage, possibly 2HKOing. Trick is to cripple anything that says the word "defensive" or "boosting sweeper". If Latias manages to cripple something this way, Heatran can have a much easier time switching in and forcing switches.

Celebi @ Life Orb
Ability: Natural Cure
Nature: Modest
EVs: 232 HP/ 240 SAtk/ 36 Spe
- Leaf Storm
- Thunder Wave
- Earth Power
- Recover
Celebi was put on the team to take down Bulky Waters; severly damaging them with Leaf Storm, mostly OHKOing. Although the Tinkerbell set dosen't need support when handling Tyranitar, the team give Celebi that support just in case, as Donphan and Scizor is easily ake on Tyranitar. Thunder Wave will cripple anything non-Ground Type that is a threat, making Pokemon such as Salamence, Dragonite, Lati@s, Gyarados, Terrakion and Choice Scarf users almost useless. This will often force a switch, letting Celebi Recover any damage that it might have taken. As for Earth Power, well, to be honest, I though that I would never be lucky to get Hidden Power Fire on a Celebi, so Earth Power seemed the next best thing.
And that does it
Feedback, opinions, support, critacism, ect would be very, very helpful.