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Seeing as we're talking about autistic explanations for Pokémon habitats, I'll share some cool ones, because I'd been going through the Regional Dex's a lot lately and finding some interesting bits of lore and retconned info:
>Magnemite
Magnemite are not artificial Pokémon. I think it was BirdKeeperToby who mentioned this recently, but you see Magnemite in the flashbacks in Kalos, thousands of years before modern magnets were made. As they pre-date human technology, their only natural place of evolution to reach their final form is Mount Coronet, so they were either created (by Arceus) /evolved (from Mew) in Sinnoh as one of the earliest developing species of Pokémon, sensitive to the regions magnetic pole - or if you take Toby's theory, they're aliens like Clefairy.
>Voltorb
Voltorb are a recent man-made discovery, but did you know they were first discovered in the Kalos Region, and not Kanto? Dex entries claim that Voltorb was first discovered in the Factory that manufactured Pokéballs. Canonically, there is literally just the one Pokéball factory, both NPC's in Kalos, and other games, allude to the factory that makes the Pokéballs and ships them worldwide. (That's obviously how they were transported worldwide too)
>Mr. Mime
Mr. Mime can't even be found in the wild in the original Kanto games, available only via trade from a single trainer you can find, similar to how trainers in LGPE will apparently trade you Alolan-Form Pokémon. In Gen 2, Mr. Mime were eventually added to the bit of grass south of Palette Town, apparently as a reference to the fact that Ash's mom caught one and uses it like a slave. So like Voltorb, this Pokémon is probably not native to Kanto at all, despite being introduced in the first generation. In Kalos, Reflection Cave (HINT, HINT) has this supposedly rare Pokémon living in large numbers, and there are even hordes of Mime Jr. too. Not to mention the obvious connection of Kalos = France = Mimes.