>>19523715>>19523760>Groudon & Kyogre's new "Mega Evolutions" are known as Primal/Prehistoric/Primeval Groudon & Primal/Prehistoric/Primeval Kyogre and are said to be a regression called Ancient Devolution.From Serebii's news article.
>A new feature introduced in Pokémon Omega Ruby & Alpha Sapphire is Prehistoric/Primal/Primeval Pokémon. These Pokémon seem to work in a similar manner to Mega Evolution through a process called Ancient Devolution, and sends the Pokémon back to their prehistoric state. Full details on this feature are not knownFrom the preliminary page on Prehistoric Pokemon.
There are no details on how to activate Ancient Devolution, nor any indication of the implements involved. Yes, "seems to work in a similar manner to Mega Evolution" more or less means that we're just waiting for them to come out and say that it's the exact same as Mega Evolution with a different name, but that isn't the same as actual, unambiguous confirmation. Which is why I asked.