My favorite set. I made the peer edit with three sets but that topic was closed and I don't use the Toxic set anymore, so I'm just going to repost these two. Cutting down on the description as well. After significantly more testing, I also decided that Life Orb on the physical set wasn't necessary, so I reduced it to a secondary option.
http://www.smogon.com/dp/pokemon/salamence
[SET]
name: S. Bulky DD Roost
move 1: Dragon Dance
move 2: Roost
move 3: Dragon Claw
move 4: Earthquake
item: Life Orb / Leftovers
nature: Adamant
evs: 172 HP / 4 Atk / 252 SpD / 80 Spe
[SET COMMENTS]
<p>This set takes advantage of Dragon Dance and Roost to give the team a Pokemon that can switch into most Special Attacks while simultaneously possess the ability to sweep. Dragon Claw and Earthquake are chosen for coverage, as only Skarmory and Bronzong resist the two.</p>
<p>Life Orb or Leftovers is a decision based on which goal is emphasized: sweeping or Special Defense? If sweeping is the primary focus, then choose Life Orb and keep the EVs as they are. These specific EVs allow Salamence to take a 269 Special Attack non STAB Ice Beam (along with a 359 Special Attack non STAB Hidden Power Ice) for less than 90% and hit back with a Dragon Dance + Life Orb boosted attack. If the attack didn't OHKO the opposition, Salamence can then Roost back up to above 10% health, as it will take half damage from the Ice attack, and then it can finish off the weakened opponent.</p>
</p>If Special Defense and Leftovers recovery are desired, then changing the EVs and Nature is necessary. 252 HP / 172 SpD / 80 Spe with a Careful nature yields 394 HP / 264 SpD / 256 Spe. This set up is approximately 10% bulkier on the Special side and 5% bulkier on the Physical side. Most importantly, Leftovers increases its survivability immensely, by reducing the omnipresent Sandstream's effect on Salamence, reducing Stealth Rock's residual effect and increasing general healing capacity.</p>
<p>256 Speed is reached with both items to always outspeed Weavile and Modest Choice Scarf Heatran after one Dragon Dance and Deoxys-S after two Dragon Dances.</p>
[SET]
name: P. Bulky DD Roost
move 1: Dragon Dance
move 2: Roost
move 3: Dragon Claw
move 4: Earthquake
item: Leftovers / Life Orb
nature: Jolly
evs: 252 HP / 180 Def / 76 Spe
[SET COMMENTS]
<p>This set uses Intimidate and Roost to be able to switch into extremely common physical threats, like Choice Band Heracross and Swords Dance Lucario, repeatedly. Dragon Dance allows Salamence to outspeed Adamant Choice Scarf Heracross and Timid Choice Scarf Heatran after one use, and Dragon Claw + Earthquake provide coverage resisted only by Skarmory and Bronzong.</p>
<p>The defensive EVs allow Salamence to take 45% maximum from a Choice Scarf Heracross, meaning Salamence can switch in and Dragon Dance and be at 22.5% health minimum, enough to allow Roost to take Salamence above 45% after Heracross' following weakened Stone Edge. An Adamant Lucario's Swords Dance Extremespeed will also never 2HKO this setup, so Salamence can easily switch in and deal with that accordingly. 280 Speed is necessary due to a large majority of physical threats falling in between the 269 -279 Speed range, such as Heracross and Lucario.</p>
<p>Salamence can run a much bulkier set if desired. 252 HP / 176 Def / 80 Spe and an Impish nature allow Salamence to reach 394 HP / 264 Def / 256 Spe. This set up is 10% bulkier than the previous one, and it still allows Salamence to outspeed Weavile and Modest Choice Scarf Heatran after one Dragon Dance and Deoxys-S after two Dragon Dances.</p>
<p>Leftovers is preferred on this physically defensive versions primarily because it will be expected to repeatedly switch into physical attacks. However, if some extra power is desired, running Life Orb with an Adamant nature and 256 Speed is a possibility, just be aware that repeatedly switching into the likes of Heracross and Lucario will no longer be a possibility.</p>
http://www.smogon.com/dp/pokemon/salamence
[SET]
name: S. Bulky DD Roost
move 1: Dragon Dance
move 2: Roost
move 3: Dragon Claw
move 4: Earthquake
item: Life Orb / Leftovers
nature: Adamant
evs: 172 HP / 4 Atk / 252 SpD / 80 Spe
[SET COMMENTS]
<p>This set takes advantage of Dragon Dance and Roost to give the team a Pokemon that can switch into most Special Attacks while simultaneously possess the ability to sweep. Dragon Claw and Earthquake are chosen for coverage, as only Skarmory and Bronzong resist the two.</p>
<p>Life Orb or Leftovers is a decision based on which goal is emphasized: sweeping or Special Defense? If sweeping is the primary focus, then choose Life Orb and keep the EVs as they are. These specific EVs allow Salamence to take a 269 Special Attack non STAB Ice Beam (along with a 359 Special Attack non STAB Hidden Power Ice) for less than 90% and hit back with a Dragon Dance + Life Orb boosted attack. If the attack didn't OHKO the opposition, Salamence can then Roost back up to above 10% health, as it will take half damage from the Ice attack, and then it can finish off the weakened opponent.</p>
</p>If Special Defense and Leftovers recovery are desired, then changing the EVs and Nature is necessary. 252 HP / 172 SpD / 80 Spe with a Careful nature yields 394 HP / 264 SpD / 256 Spe. This set up is approximately 10% bulkier on the Special side and 5% bulkier on the Physical side. Most importantly, Leftovers increases its survivability immensely, by reducing the omnipresent Sandstream's effect on Salamence, reducing Stealth Rock's residual effect and increasing general healing capacity.</p>
<p>256 Speed is reached with both items to always outspeed Weavile and Modest Choice Scarf Heatran after one Dragon Dance and Deoxys-S after two Dragon Dances.</p>
[SET]
name: P. Bulky DD Roost
move 1: Dragon Dance
move 2: Roost
move 3: Dragon Claw
move 4: Earthquake
item: Leftovers / Life Orb
nature: Jolly
evs: 252 HP / 180 Def / 76 Spe
[SET COMMENTS]
<p>This set uses Intimidate and Roost to be able to switch into extremely common physical threats, like Choice Band Heracross and Swords Dance Lucario, repeatedly. Dragon Dance allows Salamence to outspeed Adamant Choice Scarf Heracross and Timid Choice Scarf Heatran after one use, and Dragon Claw + Earthquake provide coverage resisted only by Skarmory and Bronzong.</p>
<p>The defensive EVs allow Salamence to take 45% maximum from a Choice Scarf Heracross, meaning Salamence can switch in and Dragon Dance and be at 22.5% health minimum, enough to allow Roost to take Salamence above 45% after Heracross' following weakened Stone Edge. An Adamant Lucario's Swords Dance Extremespeed will also never 2HKO this setup, so Salamence can easily switch in and deal with that accordingly. 280 Speed is necessary due to a large majority of physical threats falling in between the 269 -279 Speed range, such as Heracross and Lucario.</p>
<p>Salamence can run a much bulkier set if desired. 252 HP / 176 Def / 80 Spe and an Impish nature allow Salamence to reach 394 HP / 264 Def / 256 Spe. This set up is 10% bulkier than the previous one, and it still allows Salamence to outspeed Weavile and Modest Choice Scarf Heatran after one Dragon Dance and Deoxys-S after two Dragon Dances.</p>
<p>Leftovers is preferred on this physically defensive versions primarily because it will be expected to repeatedly switch into physical attacks. However, if some extra power is desired, running Life Orb with an Adamant nature and 256 Speed is a possibility, just be aware that repeatedly switching into the likes of Heracross and Lucario will no longer be a possibility.</p>