I've been using this team for quite some time now. It does really well and has gotten me quite a few wins. It plays like any suicidal offensive team.
Send in a sweeper and set up. Then just weaken whatever switches in and sacrifice said sweeper, then repeat. I referred to Stathakis' Greek RMT for the team building guidlines and I found them to be quite helpful.
Anyways on to the team:
Infernape@Focus Sash
Naive
4 Atk/ 252 SAtk/ 252 Spe
-Stealth rock
-Encore
-Fire Blast
-Close Combat
Lead Infernape is a very good way to start the battle off. Due to his speed, he will almost always get up Stealth Rock, which helps the team quite a bit. The EVs let him deal decent damage while outrunning every common lead bar Azelf and Aerodactyl. Fire Blast and Close Combat dish out a very high amount of damage thanks to STAB. Encore is the real move that makes him so useful. He can use it to trap slower leads like Hippowdon, Swampert, and Metagross on stealth rock which forces them to switch out. He can also Encore the standard Lead Infernape since he outruns him and can Encore the Fake Out. It also lets me set up my sweepers if my opponents decides to use a Water or Ground move on Infernape. Usually, I just let him set up rocks, dish out damage and then die, letting me bring in my first sweeper. He attains pretty good synergy with Gyarados in a sence, as he can often Encore SE hits which Gyarados usually resists.
Gyarados@Life Orb
Jolly
252 Atk/ 4 Def/ 252 Spe
-Dragon Dance
-Waterfall
-Bounce
-Stone edge
Gyarados is an excellent way to start tearing my opponents team early. The EVs let hit 430 Speed after a Dragon Dance, letting me outrun Jolteon and even Scarf Heatran which is pretty useful and dealing a OHKO to both. The move set is fairly simple. Waterfall lets me hit shit hard thanks to STAB. Stone Edge gives pretty good coverage, letting me hit Zapdos, Salamence, and enemy Gyarados. Bounce is also a very important move. It lets me scare off Celebi, and hit several bulky waters such as Starmie and has a chance to OHKO and dents Latias as well. It also has that nice paralysis rate which has been helpful in some cases. I prefer Life Orb for a few reasons. First, I don't have an Adamant nature so the extra power is really useful. The other reason is that Gyarados usually doesn't stay in play very long and I would much rather hit something hard than get some extra recovery in that little amount of time. Usually, this guy comes in after Infernape, sets up, and weakens whatever is supposed to counter him(if not kill in the case of Jolteon.) He usually helps weaken some bulky water which makes it easier for the rest of my team to sweep.
Heatran@Shuca Berry
Naive
4 atk/ 252 SAtk/ 252 Spe
-Fire Blast
-Earth Power
-Explosion
-HP Elec/Dragon Pulse
Heatran is one of the most important members on the team. His typing lets him resist Bullet Punch, which is often used to pick off my weakened sweepers, so he uses the oppurtunity to get a safe switch. I usually run HP Elec, as it lets me OHKO Gyarados, who is the most common pokemon used to counter Heatran. With Shuca Berry, Heatran passes off as a Scarf Heatran, which lets me get the jump on Blissey, Gyarados, Salamence, and several other "counters." Dragon Pulse isn't usually used less though it has its uses, hitting Dragonite,Salamence and Flygon pretty hard. Usually, once he's gotten a surprise KO, I just blow up and let another sweeper switch in without having to take damage. His speed is a bit of a let down but he is usually able to outrun common counters so it isn't as big of a deal.
Latias@Life Orb
Timid
4 HP/ 252 SAtk/ 252 Spe
-Calm Mind
-Dragon Pulse
-Surf
-Recover
Latias is the glue of the team. It helps keep Infernape and other fast sweepers in check. I usually have an easy time using Calm Mind with her, as such I am able to smack whatever switches in pretty hard. I usually send her in after Heatran has done his job, meaning Blissey took the hit from Explosion. Dragon Pulse and Surf have pretty good coverage. Latias' most common switch in is Scizor in my experience, but I usually don't mind as I get to take off over half of its health with a +1 Surf, then he will either get locked in Pursuit which lets one of my sweepers set up, or use U-turn, giving me the adavantage. Recover isn't used much though helps a lot when it is. EVs are pretty straight forward. Max in Special Attack to let Dragon Pulse and Surf do as much damage as possible while max Speed is ran to let it outrun near everything that doesn't have a scarf. I have considered using a more offensive set with something like Draco Meteor-T-bolt-Surf-Recover but I feel that set will make it easier for stuff to set up on me due to Draco Meteor's Special Attack drop.
Salamence@Life Orb
Naive
232 Atk/ 252 Spe/ 24 SAtk
-Dragon dance
-EQuake
-Outrage
-Fire Blast
Salamence is a monster late game. After the first Dragon Dance assault, most of his counters such as Swampert are usually weakened if not dead letting him have an easy time with my opponents team. The moves allow for perfect coverage. Outrage gets STAB and dents pretty much everything that doesn't resist it. Fire Blast and EQuake compliment it well, hitting Steel types that resist Outrage. I went with a positive speed nature to ensure that scarfers can't revenge kill me, such as Jirachi and Flygon. The extra power although useful, usually isn't needed as much as the speed. It also lets me tie with other max speed base 100 pokemon at worst if I haven't used Dragon Dance quite yet. Once I send him in, it's usually close to the end of the battle. Intimidate is pretty useful also, as it can be used as a last ditch attempt to stop a random physical sweeper late game. The EVs are standard and allow for the best results. Max Speed is a given while 24 in SAtk lets me get a useful 2HKO against Bronzong. The rest is dumped into Attack for maximum damage.
Jolteon@Life Orb
Timid
252 SAtk/ 4 Def/ 252 Spe
-T-bolt
-Shadowball
-HP Grass
-Signal Beam
Jolteon is usually the late game cleaner. Once everything is said and done, he just comes in and finishes off any weakened pokemon with Thunderbolt. I usually only send him out late game, as there are too many danagerous mons that can use him as set up, such as DD Tyritar. The moves are simple, T-bolt does loads of damage and gets STAB. Shadow Ball helps with coverage and lets me hit Ghosts such as Gengar and Dusknoir. HP Grass lets me hit Grounds who are immune to T-Bolt such as Swampert and Signal Beam is mainly filler though it deals extra damage to Celebi and hits Umbreon and Tyranitar for SE damage despite how little it is. Life Orb is the preferred item as I don't want to let anything get the chance to set up. EVs are also simple, yet effective.
Well that's the team. Almost everything here is pretty fast which is pretty useful and can deal their own share of damage. As long as I don't slip up early, I can usually win. Any suggestions are appreciated.
Send in a sweeper and set up. Then just weaken whatever switches in and sacrifice said sweeper, then repeat. I referred to Stathakis' Greek RMT for the team building guidlines and I found them to be quite helpful.
Anyways on to the team:

Infernape@Focus Sash
Naive
4 Atk/ 252 SAtk/ 252 Spe
-Stealth rock
-Encore
-Fire Blast
-Close Combat
Lead Infernape is a very good way to start the battle off. Due to his speed, he will almost always get up Stealth Rock, which helps the team quite a bit. The EVs let him deal decent damage while outrunning every common lead bar Azelf and Aerodactyl. Fire Blast and Close Combat dish out a very high amount of damage thanks to STAB. Encore is the real move that makes him so useful. He can use it to trap slower leads like Hippowdon, Swampert, and Metagross on stealth rock which forces them to switch out. He can also Encore the standard Lead Infernape since he outruns him and can Encore the Fake Out. It also lets me set up my sweepers if my opponents decides to use a Water or Ground move on Infernape. Usually, I just let him set up rocks, dish out damage and then die, letting me bring in my first sweeper. He attains pretty good synergy with Gyarados in a sence, as he can often Encore SE hits which Gyarados usually resists.

Gyarados@Life Orb
Jolly
252 Atk/ 4 Def/ 252 Spe
-Dragon Dance
-Waterfall
-Bounce
-Stone edge
Gyarados is an excellent way to start tearing my opponents team early. The EVs let hit 430 Speed after a Dragon Dance, letting me outrun Jolteon and even Scarf Heatran which is pretty useful and dealing a OHKO to both. The move set is fairly simple. Waterfall lets me hit shit hard thanks to STAB. Stone Edge gives pretty good coverage, letting me hit Zapdos, Salamence, and enemy Gyarados. Bounce is also a very important move. It lets me scare off Celebi, and hit several bulky waters such as Starmie and has a chance to OHKO and dents Latias as well. It also has that nice paralysis rate which has been helpful in some cases. I prefer Life Orb for a few reasons. First, I don't have an Adamant nature so the extra power is really useful. The other reason is that Gyarados usually doesn't stay in play very long and I would much rather hit something hard than get some extra recovery in that little amount of time. Usually, this guy comes in after Infernape, sets up, and weakens whatever is supposed to counter him(if not kill in the case of Jolteon.) He usually helps weaken some bulky water which makes it easier for the rest of my team to sweep.

Heatran@Shuca Berry
Naive
4 atk/ 252 SAtk/ 252 Spe
-Fire Blast
-Earth Power
-Explosion
-HP Elec/Dragon Pulse
Heatran is one of the most important members on the team. His typing lets him resist Bullet Punch, which is often used to pick off my weakened sweepers, so he uses the oppurtunity to get a safe switch. I usually run HP Elec, as it lets me OHKO Gyarados, who is the most common pokemon used to counter Heatran. With Shuca Berry, Heatran passes off as a Scarf Heatran, which lets me get the jump on Blissey, Gyarados, Salamence, and several other "counters." Dragon Pulse isn't usually used less though it has its uses, hitting Dragonite,Salamence and Flygon pretty hard. Usually, once he's gotten a surprise KO, I just blow up and let another sweeper switch in without having to take damage. His speed is a bit of a let down but he is usually able to outrun common counters so it isn't as big of a deal.

Latias@Life Orb
Timid
4 HP/ 252 SAtk/ 252 Spe
-Calm Mind
-Dragon Pulse
-Surf
-Recover
Latias is the glue of the team. It helps keep Infernape and other fast sweepers in check. I usually have an easy time using Calm Mind with her, as such I am able to smack whatever switches in pretty hard. I usually send her in after Heatran has done his job, meaning Blissey took the hit from Explosion. Dragon Pulse and Surf have pretty good coverage. Latias' most common switch in is Scizor in my experience, but I usually don't mind as I get to take off over half of its health with a +1 Surf, then he will either get locked in Pursuit which lets one of my sweepers set up, or use U-turn, giving me the adavantage. Recover isn't used much though helps a lot when it is. EVs are pretty straight forward. Max in Special Attack to let Dragon Pulse and Surf do as much damage as possible while max Speed is ran to let it outrun near everything that doesn't have a scarf. I have considered using a more offensive set with something like Draco Meteor-T-bolt-Surf-Recover but I feel that set will make it easier for stuff to set up on me due to Draco Meteor's Special Attack drop.

Salamence@Life Orb
Naive
232 Atk/ 252 Spe/ 24 SAtk
-Dragon dance
-EQuake
-Outrage
-Fire Blast
Salamence is a monster late game. After the first Dragon Dance assault, most of his counters such as Swampert are usually weakened if not dead letting him have an easy time with my opponents team. The moves allow for perfect coverage. Outrage gets STAB and dents pretty much everything that doesn't resist it. Fire Blast and EQuake compliment it well, hitting Steel types that resist Outrage. I went with a positive speed nature to ensure that scarfers can't revenge kill me, such as Jirachi and Flygon. The extra power although useful, usually isn't needed as much as the speed. It also lets me tie with other max speed base 100 pokemon at worst if I haven't used Dragon Dance quite yet. Once I send him in, it's usually close to the end of the battle. Intimidate is pretty useful also, as it can be used as a last ditch attempt to stop a random physical sweeper late game. The EVs are standard and allow for the best results. Max Speed is a given while 24 in SAtk lets me get a useful 2HKO against Bronzong. The rest is dumped into Attack for maximum damage.

Jolteon@Life Orb
Timid
252 SAtk/ 4 Def/ 252 Spe
-T-bolt
-Shadowball
-HP Grass
-Signal Beam
Jolteon is usually the late game cleaner. Once everything is said and done, he just comes in and finishes off any weakened pokemon with Thunderbolt. I usually only send him out late game, as there are too many danagerous mons that can use him as set up, such as DD Tyritar. The moves are simple, T-bolt does loads of damage and gets STAB. Shadow Ball helps with coverage and lets me hit Ghosts such as Gengar and Dusknoir. HP Grass lets me hit Grounds who are immune to T-Bolt such as Swampert and Signal Beam is mainly filler though it deals extra damage to Celebi and hits Umbreon and Tyranitar for SE damage despite how little it is. Life Orb is the preferred item as I don't want to let anything get the chance to set up. EVs are also simple, yet effective.
Well that's the team. Almost everything here is pretty fast which is pretty useful and can deal their own share of damage. As long as I don't slip up early, I can usually win. Any suggestions are appreciated.