But what I find odd is that they made and entire catergory just for primal pokemon instead of including them as megas. So in the end there will be three primals with a whole category dedicated to themselves, to the weather trio? If these transformations were to be more exvlusive why not call primal Kyogre Alpha Kyogre or Primal Groudon Omega Groudon? Why the generic Primal title if no other pokemon will have these sort of transformation? I might be wrong though but it makes me suspicious. There are other pokemon that seem to fit with the primal theme and within this category.
I understand, but they have given certain Pokémon or groups of Pokémon exclusive features before.
There are the Therian Formes for Unova's flying trio; that's an entire category just for those three. They could just have used the term Origin Forme for them, a term that was already established and that only Giratina had. It would have fit perfectly too, since the Therian Formes are apparently their "original shape", and yet they created the Therian Forme concept just for them. And if that has been done for them, a minor legendary trio, why not for the main, box-featured duo of a pair of remakes?
There are even features that have been given to a single member of a trio, like Giratina's Origin Forme that I just mentioned, Xerneas's Active Mode, and Kyurem's ability to fuse with one of the other two dragons. This is also why I'm not taking Primal Rayquaza for granted.
And, as you said, primal reversion has something to do with the pokemon being able to absorb natural energy thus triggering a transformation, the weather trio is capable of doing this as demonstrated but are they really the only ones capable of absorbing natural energy?
Right now, Primal Reversion has everything to do with the Pokémon being able to absorb natural energy. That is all the official site has told us about why Primal Reversion happened.
But besides all of that, if Primal Reversion is going to work just like Mega Evolution, and be given to many Pokémon, again just like Mega Evolution, why create the concept in the first place? Why not make them all Mega Evolutions? I think it is because Primal Reversion, as a game concept, was created to give the main legendaries of the remakes something a bit different, something that set them apart from all the other Pokémon with Mega Evolutions.
It would be just like why Therian Formes were made. They are a different term from Giratina's Origin Forme, but are essentially the same thing - it simply gives all of the legendary Pokémon involved something unique to each of them. I think the same will be true for Primal Reversion: a kind of Mega Evolution unique to the weather trio.
Even Corsola could get a Primal, as Corals existed in the distant past (interestingly Pacificlodge is said to have been built over Corsola, and that town seems to have a connection to the Regis (plus Sky Pillar is nearby) so it maybe old).
The other Pokemon on that list are the fossils which are ancient and can probably draw more of the power of the past. Also Claydol and Bronzong are quite ancient too. Then there's Carbink which was created after millions of years, so it may actually have been created by the natural energy coming in contact with a diamond on the ground.
This is another thing. Why didn't Diancie get a Primal Reversion? If any other Pokémon can claim to be super ancient, it is Diancie. It is legendary, it was once a Carbink, and Carbink, as you said, spent millions of years underground after being formed by nature.
Primal Reversion had already been shown when Mega Diancie was revealed too, so they didn't have that restriction of spoiling a new mechanic, unlike with Aerodactyl getting a Mega on XY.
So yet again, I don't think a Pokémon being ancient is the important part of Primal Reversion, but I agree with what you said about how Ancient Power could work for triggering it on the two that are confirmed to have it.
