This team is around the one and only deadly Dragon Dancing Salamence. I usually start my teams by balancing a weakness resistance chart while making sure I have: a solid lead, a scarfed Pokemon, a Scizor counter lol, and so on. From there I see what I am weak to from the top OU threats and alter the team to fit those needs. Finally, I post it on Smogon or get assistance from friends.
Movesets:
Heatran @ Shuca Berry
4 HP / 252 SpA / 252 Spe
Timid Nature
Ability: Flash Fire
~ Stealth Rock
~ Fire Blast
~ Earth Power
~ Taunt
Heatran brings great things to the table and the lead set is not all that bad. It used to be standard to run Explosion but in this team's case, Heatran will want to be conserved if neccesary. Recently added Taunt because I forgot Heatran could learn Taunt, it will definitely help my team against stall. So that is just excellent!
Rotom-F @ Leftovers
252 HP / 168 Def / 88 Spe
Bold Nature
Ability: Levitate
~ Thunderbolt
~ Shadow Ball
~ Will-O-Wisp
~ Pain Split
Standard Frost Form Rotom, it helps against many things. My Scizor counter, and probably my favorite one to be honest. I recently added Pain Split because I like the idea of recovery on this thing, it would have helped in past battles I know that much. I use Freezer form so that I can confuse my opponent of course.
Jirachi @ Choice Scarf
252 Spe / 252 Atk / 4 HP
Jolly Nature
Ability: Serene Grace
~ Iron Head
~ Fire Punch
~ Ice Punch
~ Trick
I wanted a revenge killer and Scarf Rachi gets the job done. I've been meaning to use a Scarf Physical Jirachi for awhile, it has a great movepool to utilize the speed. Hitting a wide variety of threats. People have recommended Thunderpunch on this Jirachi but isn't the Rotom enough to handle things like Gyarados? Added Trick to handle annoying stall stuff and Suicunes that want to set up.
Starmie @ Leftovers
136 HP / 156 Def / 216 Spe
Timid Nature
Ability: Natural Cure
~ Rapid Spin
~ Surf
~ Thunderbolt
~ Recover
Bulky Starmie because it gets rid of Rocks and stuff so that Salamence isn't screwed. It also acts as a solid sweeper and has lasting power due to Recover. Having another really fast Pokemon in the wings in case Jirachi dies is never a bad thing.
Breloom @ Toxic Orb
12 HP / 252 Atk / 244 Spe
Adamant Nature
Ability: Poison Heal
~ Spore
~ Focus Punch
~ Seed Bomb
~ Stone Edge
Standard Spore Punching Breloom. Assuming they give you the chance to set up and don't have a counter, this Breloom is an absolute monster. Recently added Stone Edge because I got raped by Zapdos without it. And most of my team has no solid answer to Zapdos. But maybe Substitute is necessary, it is what made Breloom really strong VIA the Poison Healing madness.
Salamence @ Leftovers
232 Atk / 252 Spe / 24 SpA
Naive Nature
Ability: Intimidate
~ Dragon Dance
~ Outrage
~ Earthquake
~ Fire Blast
Star of the Team, now an offensive Salamence. Fire Blast is there to counter Scizor and steel walls that try to ruin my sweep. I must admit the set is too Smogon standard and might need revisions depending on this team, so I'm not sure yet.
Chart:
Movesets:

Heatran @ Shuca Berry
4 HP / 252 SpA / 252 Spe
Timid Nature
Ability: Flash Fire
~ Stealth Rock
~ Fire Blast
~ Earth Power
~ Taunt
Heatran brings great things to the table and the lead set is not all that bad. It used to be standard to run Explosion but in this team's case, Heatran will want to be conserved if neccesary. Recently added Taunt because I forgot Heatran could learn Taunt, it will definitely help my team against stall. So that is just excellent!

Rotom-F @ Leftovers
252 HP / 168 Def / 88 Spe
Bold Nature
Ability: Levitate
~ Thunderbolt
~ Shadow Ball
~ Will-O-Wisp
~ Pain Split
Standard Frost Form Rotom, it helps against many things. My Scizor counter, and probably my favorite one to be honest. I recently added Pain Split because I like the idea of recovery on this thing, it would have helped in past battles I know that much. I use Freezer form so that I can confuse my opponent of course.

Jirachi @ Choice Scarf
252 Spe / 252 Atk / 4 HP
Jolly Nature
Ability: Serene Grace
~ Iron Head
~ Fire Punch
~ Ice Punch
~ Trick
I wanted a revenge killer and Scarf Rachi gets the job done. I've been meaning to use a Scarf Physical Jirachi for awhile, it has a great movepool to utilize the speed. Hitting a wide variety of threats. People have recommended Thunderpunch on this Jirachi but isn't the Rotom enough to handle things like Gyarados? Added Trick to handle annoying stall stuff and Suicunes that want to set up.

Starmie @ Leftovers
136 HP / 156 Def / 216 Spe
Timid Nature
Ability: Natural Cure
~ Rapid Spin
~ Surf
~ Thunderbolt
~ Recover
Bulky Starmie because it gets rid of Rocks and stuff so that Salamence isn't screwed. It also acts as a solid sweeper and has lasting power due to Recover. Having another really fast Pokemon in the wings in case Jirachi dies is never a bad thing.

Breloom @ Toxic Orb
12 HP / 252 Atk / 244 Spe
Adamant Nature
Ability: Poison Heal
~ Spore
~ Focus Punch
~ Seed Bomb
~ Stone Edge
Standard Spore Punching Breloom. Assuming they give you the chance to set up and don't have a counter, this Breloom is an absolute monster. Recently added Stone Edge because I got raped by Zapdos without it. And most of my team has no solid answer to Zapdos. But maybe Substitute is necessary, it is what made Breloom really strong VIA the Poison Healing madness.

Salamence @ Leftovers
232 Atk / 252 Spe / 24 SpA
Naive Nature
Ability: Intimidate
~ Dragon Dance
~ Outrage
~ Earthquake
~ Fire Blast
Star of the Team, now an offensive Salamence. Fire Blast is there to counter Scizor and steel walls that try to ruin my sweep. I must admit the set is too Smogon standard and might need revisions depending on this team, so I'm not sure yet.
Chart:
