No it does not have a primal evolution instead it has a mega evolution
well mostly you can get primal rayquaza in battle area
Rayquaza currently does not have an evolution.
No Groudon will not be able to mega evolve in Pokémon Omega Ruby or Pokémon Alpha Sapphire however Groudon itself is capable of doing a primal reversion which will revert it into Primal Groudon but it needs to be holding the Red Orb item in order to become Primal Groudon and while the primal reversion is similar to the process of Mega Evolution the process of Primal Reversion is automatically triggered and does not count towards the limit of only one Mega Evolution per battle.
One thing more, the pokedex code is what region they were. Rayquaza is in the Hoenn region while Skarmory is in the Johto region.
The details regarding the new De-evolution method in Pokémon Omega Ruby and Pokémon Alpha Sapphire is that it's not a de-evolution mechanic but rather a Primal Reversion that will allow Groudon and Kyogre to revert to their Ancient forms of Primal Groudon and Primal Kyogre however they will need to be holding the Red and Blue Orbs respectively in order to Primal revert and then as soon as they enter into a battle they will primal revert and Primal Pokémon do not count towards the "1 Mega Evolution per battle" limit.
after you beat rayquaza, go to wishcash pond and there should be luminous cave there. go in for evolution.
X3 Ha,That thing was just some evolution hack,Zigzagoon evolve at 20 into Linoone and that's it.
The region-specific dragon Pokemon (only found in Hoenn) are Vibrava (evolution of Trapinch), Flygon, Altaria (evolution of Swablu), Bagon, Shelgon, Salamence, Latias, Latios and Rayquaza.
well when u get far enough in the game u obtain this primal stone for groudon, give it to him as a held item and then go into battle, he will primal evolve right when the battle begins and can happen many times, not just once a battle
it madders which game . ruby: groudon, sapphire: keyoger, and emerald: rayquaza. but if you did not catch one of themm when your suppose to your beginner Pokemon at it's final evolution.
Primal Kyogre's new attack is Origin Pulse and Primal Groudon's new attack is called Precipice Blades.
Primal Carnage happened in 360.