About the evolutionary stone thing, wouldn’t it make sense that pokemon were once able to naturally evolve into their “stone evolutions” simply because the world was brimming with primal energy?
Not quite sure which “evolutionary stone thing” we’re talking about, but it makes sense given some of the things that I like to believe, namely:
1) In the “Primal Age” described by Zinnia in Alpha Sapphire and Omega Ruby, the boundless life energy that allowed Groudon and Kyogre to achieve their Primal forms may have had similar effects for other Pokémon, and this may be where Mega Evolution and perhaps the giant Pokémon in The Ancient Puzzle of Pokémopolis come from.
2) Evolved forms that require evolutionary stones are vestigial, having disappeared from the natural world because they are no longer suited to changing environmental conditions – there could be a whole lot of species-specific explanations for this, or you could just attribute all of them to the waning life energy of the world after the end of the Primal Age.
It also fits rather nicely with the fact that, so far anyway, there are no Mega evolutions of Pokémon that have evolved using stones (except Gallade, but he needed one for symmetry). This could still change in the future; I don’t think we have good reason to believe it’s a Rule, but as long as it stays true, I think we’re allowed to suspect that the two phenomena may be similar in other ways too.
The thing is, I don’t really have proof for either 1) or 2); 1) is just part of a lot of mad speculation I came up with while playing Alpha Sapphire for the first time as a result of being convinced that all our information was coming from incomplete and biased sources, while 2) is a consequence of trying to view Pokémon evolution in the light of how evolution works in the real world, which is dangerous territory at the best of times. So I would like it if things worked that way, but I’m nervous about coming out and saying “yes, this is how it works.” If that makes sense.