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I made this list a while ago, posting it here now. This is 100% headcanon but everything is based on either in-game text/Pokedex entries, or from another region having better wild distribution then when it debuted (so giftmons and rarespawns fall under here). I.e. if the Pokemon doesn't make sense in its debut region, unless there's some reason to think otherwise I don't count it.
I'll explain a couple of things:
>Alola mons under Galar
To me, it makes a lot more sense that some of these originated in Galar and then made it to Alola then the other way around. There's some exceptions like Pyukumuku and Oranguru that I don't care how you put it, they don't belong in Galar, but that's another story.
>Others
>Since Meowth at this point has two regional variants and one of its evos is literally called Persian, the chances of it actually originating in Kanto are low even though it's still called Kantonian
>Tangela is Sevii Islands
>Porygon is probably built in Kanto but it could be somewhere else with Mewtwo in Guyana
>Chatot is rare in Sinnoh and the only other region it has an appearance in is Kalos but only around periphery islands, so I think it could be native somewhere else
>Toxel is gifted to you and found in the wild below the bridge, but it's most likely a foreign species introduced by people
>Galar Meowth and Perrserker don't make sense as just originating in Galar and staying there from their lore, I think they were from another region and settled in GAlar
Rest of those are for obvious reasons.
