Rayquaza missed out this set in the analysis on-site.
http://www.smogon.com/bw/pokemon/rayquaza
[SET]
name: Mixed Dancer
move 1: Draco Meteor
move 2: Dragon Dance
move 3: Outrage
move 4: Earthquake / Fire Blast
item: Life Orb
nature: Mild
EVs: 40 Atk / 252 SpA / 216 Spe
[Set Comments]
<p>Similar to Salamence's old set in DPP, this Rayquaza set utilizes a lot of surprise factor to eliminate its usual counters. Unlike the Mixed set, this Rayquaza is easily able to sweep on its own, even after using Draco Meteor. Partnering it with Salamence is not crucial to this set's usefulness though. The biggest differences between this set and the standard Dragon Dance set are obviously Draco Meteor and the different EV spread.</p>
<p>Most people tend to overlook Rayquaza's massive Special Attack stat, which allows it to easily bash through its usual counters. Draco Meteor will easily OHKO Support Groudon, while even Lugia takes a massive 57.2% - 67.8%, which will 2HKO with Stealth Rock damage. This not only gives Rayquaza a chance to sweep, but also paves the way for other physical sweepers to sweep with Groudon out of the way. Draco Meteor tears off 69.8% - 82.4% from Support Arceus, taking it out with Spikes and Stealth Rock support. Other Arceus can be taken out as well. A boosted Outrage will still OHKO Arceus with little prior damage, so choose carefully when deciding whether to boost up or just attack right away against Arceus.</p>
<p>The idea of using this set is to Dragon Dance up as Groudon or another physical wall switches in and go straight for the OHKO. With this strategy, you can easily sweep with Rayquaza should the opponent lack another check to it. Most teams do not carry extra checks to Rayquaza as there are really few of them. Outrage is Rayquaza's physical move of choice. Even with few Attack EVs, Rayquaza's Outrage is still incredibly powerful, capable of 2HKOing even the bulkiest Kyogre when unboosted. Ho-Oh is easily OHKOed after Stealth Rock by both Draco Meteor or Outrage. Even if Stealth Rock is not up, Rayquaza can easily smash Ho-Oh with a +1 Outrage, something the standard Mixed Rayquaza cannot do.</p>
<p>The choice of Fire Blast or Earthquake is totally up to your team's preferences. Fire Blast utilizes this set's focus on Special Attack EVs, and OHKOes Skarmory, Forretress (provided Sturdy is broken), Ferrothorn, Metagross, and Scizor. Earthquake on the other hand is boosted by Dragon Dance and smashes Dialga, Jirachi, and Heatran. Unfortunately, Rayquaza cannot carry five moves, so pick the one that suits your team best.</p>
[Additional Comments]
<p>This set greatly enjoys entry hazards support, as it is the only way Rayquaza can break through Lugia. Forretress and Deoxys-S make fantastic partners for this reason, and Forretress can also spin away entry hazards. Swords Dance Arceus is also incredibly annoying, as Extremespeed will tear a chunk out of Rayquaza's health. Packing a check to it, such as Terrakion, is important for this set to function at its best, although Draco Meteor will likely OHKO Offensive Arceus after just Stealth Rock alone. Scizor's Bullet Punch can also make Rayquaza sad, but Fire Blast OHKOes Scizor 100% of the time even after using Draco Meteor once.</p>
<p>The reason for using a Rash or Mild nature on this set is to OHKO Groudon 100% of the time after just Stealth Rock damage. Rayquaza sadly fails to do that with a Hasty or Naive nature. Groudon will likely switch in on Rayquaza early on the match, so this is your best opportunity to surprise and take it. The Special Attack EVs are crucial for Rayquaza to OHKO Groudon and stands a chance of KOing Offensive Arceus after Stealth Rock damage. Attack EVs are just leftover EVs, and you can just max out Speed if you do not mind a little less powerful Outrage or Earthquake if you are using it. The Speed EVs allow Rayquaza to outspeed everything up to a neutral nature Deoxys-A and neutral nature Choice Scarf Pokemon with base 90 Speed at +1 Speed. Darkrai is a great partner for this set to take out Lugia, while Rayquaza demolishes Ho-Oh and Groudon. Rayquaza can also OHKO potential Scarf Kyogre switch-ins with Draco Meteor. This set can just fire off powerful Draco Meteors right away instead of having to set up like the standard Dragon Dance set. The major drawback of using this set is that Timid Scarf Dialga, Kyogre, and Reshiram can outspeed this set-even at +1 and KO you first.</p>
Uhh, I discussed this with Jibaku on IRC and he agreed that this set works well like Salamence's WallBreaking set in generation 4.
QC APPROVED (1/3)

http://www.smogon.com/bw/pokemon/rayquaza
[SET]
name: Mixed Dancer
move 1: Draco Meteor
move 2: Dragon Dance
move 3: Outrage
move 4: Earthquake / Fire Blast
item: Life Orb
nature: Mild
EVs: 40 Atk / 252 SpA / 216 Spe
[Set Comments]
<p>Similar to Salamence's old set in DPP, this Rayquaza set utilizes a lot of surprise factor to eliminate its usual counters. Unlike the Mixed set, this Rayquaza is easily able to sweep on its own, even after using Draco Meteor. Partnering it with Salamence is not crucial to this set's usefulness though. The biggest differences between this set and the standard Dragon Dance set are obviously Draco Meteor and the different EV spread.</p>
<p>Most people tend to overlook Rayquaza's massive Special Attack stat, which allows it to easily bash through its usual counters. Draco Meteor will easily OHKO Support Groudon, while even Lugia takes a massive 57.2% - 67.8%, which will 2HKO with Stealth Rock damage. This not only gives Rayquaza a chance to sweep, but also paves the way for other physical sweepers to sweep with Groudon out of the way. Draco Meteor tears off 69.8% - 82.4% from Support Arceus, taking it out with Spikes and Stealth Rock support. Other Arceus can be taken out as well. A boosted Outrage will still OHKO Arceus with little prior damage, so choose carefully when deciding whether to boost up or just attack right away against Arceus.</p>
<p>The idea of using this set is to Dragon Dance up as Groudon or another physical wall switches in and go straight for the OHKO. With this strategy, you can easily sweep with Rayquaza should the opponent lack another check to it. Most teams do not carry extra checks to Rayquaza as there are really few of them. Outrage is Rayquaza's physical move of choice. Even with few Attack EVs, Rayquaza's Outrage is still incredibly powerful, capable of 2HKOing even the bulkiest Kyogre when unboosted. Ho-Oh is easily OHKOed after Stealth Rock by both Draco Meteor or Outrage. Even if Stealth Rock is not up, Rayquaza can easily smash Ho-Oh with a +1 Outrage, something the standard Mixed Rayquaza cannot do.</p>
<p>The choice of Fire Blast or Earthquake is totally up to your team's preferences. Fire Blast utilizes this set's focus on Special Attack EVs, and OHKOes Skarmory, Forretress (provided Sturdy is broken), Ferrothorn, Metagross, and Scizor. Earthquake on the other hand is boosted by Dragon Dance and smashes Dialga, Jirachi, and Heatran. Unfortunately, Rayquaza cannot carry five moves, so pick the one that suits your team best.</p>
[Additional Comments]
<p>This set greatly enjoys entry hazards support, as it is the only way Rayquaza can break through Lugia. Forretress and Deoxys-S make fantastic partners for this reason, and Forretress can also spin away entry hazards. Swords Dance Arceus is also incredibly annoying, as Extremespeed will tear a chunk out of Rayquaza's health. Packing a check to it, such as Terrakion, is important for this set to function at its best, although Draco Meteor will likely OHKO Offensive Arceus after just Stealth Rock alone. Scizor's Bullet Punch can also make Rayquaza sad, but Fire Blast OHKOes Scizor 100% of the time even after using Draco Meteor once.</p>
<p>The reason for using a Rash or Mild nature on this set is to OHKO Groudon 100% of the time after just Stealth Rock damage. Rayquaza sadly fails to do that with a Hasty or Naive nature. Groudon will likely switch in on Rayquaza early on the match, so this is your best opportunity to surprise and take it. The Special Attack EVs are crucial for Rayquaza to OHKO Groudon and stands a chance of KOing Offensive Arceus after Stealth Rock damage. Attack EVs are just leftover EVs, and you can just max out Speed if you do not mind a little less powerful Outrage or Earthquake if you are using it. The Speed EVs allow Rayquaza to outspeed everything up to a neutral nature Deoxys-A and neutral nature Choice Scarf Pokemon with base 90 Speed at +1 Speed. Darkrai is a great partner for this set to take out Lugia, while Rayquaza demolishes Ho-Oh and Groudon. Rayquaza can also OHKO potential Scarf Kyogre switch-ins with Draco Meteor. This set can just fire off powerful Draco Meteors right away instead of having to set up like the standard Dragon Dance set. The major drawback of using this set is that Timid Scarf Dialga, Kyogre, and Reshiram can outspeed this set-even at +1 and KO you first.</p>
Uhh, I discussed this with Jibaku on IRC and he agreed that this set works well like Salamence's WallBreaking set in generation 4.

QC APPROVED (1/3)