Rayquaza @ Life Orb
Trait: Air Lock
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
-Dragon Dance
-Substitute
-Outrage
-Earthquake / Fire Blast
Dragon Dance Rayquaza is extremely threatening, but with all the Choice Scarf Genesect and Choice Scarf Palkia running rampant its extremely hard to use effectively. This Rayquaza attempts to bait out these Choice Scarf Pokemon and setup a Substitute so that it can OHKO them the turn after, meaning it will be able to spam Outrage some more or start an uninterrupted sweep. Substitute has other hilarious merits as well. It allows it to beat Chansey lacking Seismic Toss, successfully troll Bisharp, and perhaps the best use of all, allow it to beat Wobbufett and Mamoswine as it CAN stomach 1 Counter and Ice Shard thanks to Substitute and proceed to 2HKO Wobba and OHKO Bisharp. It does have a bit more trouble deciding whether it hates Skarmory or Heatran more but its not that bad, especially considering how (un)common the two are.
Rayquaza @ Life Orb
Trait: Air Lock
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
-Swords Dance
-Thunder Wave / Substitute
-Dragon Claw
-V-Create / Earthquake
The same goal as Substitute Dragon Dance Rayquaza is seen in this "twisted" version of Swords Dance Rayquaza. Lure out Palkia and Genesect, and Thunder Wave the switch-in or just throw up a Substitute in front of it, then OHKO either with Earthquake, V-Create, or Dragon Claw. Both moves support V-Create but its slashed with Earthquake anyway in case you have issues with Heatran on your team. The loss of ExtremeSpeed is somewhat compensated for since your revenge-killing issues are assuaged.
Also yes I'm lazy I like to use the same sprites :P. I also do think Steeldragon tried something like this earlier but I can't confirm if he did or not :(.