>>58290850Close but not quite.
The original plan is for the game to take place across the whole country. Kantomons are just default commons native to the whole country/world while the new Pokemon are rare and newly discovered for the first time. That's why there's no Johto Pokedex, only the New Pokedex for the whole world.
Despite the original country map being reworked into a new region called Johto, they had to stick with the original "there's no regional dex, only new mons across the world" philosophy for Pokemon availability for Johto because they didn't even know what would be in the new dex as mons were constantly being cut, reworked, and added rapidly in the months leading up to release. There was no time to come up with what is now the current regional dex philosophy because the roster wasn't finalized up until the very end.
It's why Misdreavus is seen nowhere but the very end of the game, she was barely finished by the time the final build of the game had to be sent out for manufacturing and distribution.
Who knows what the fuck happened with Houndour and Houndoom though, they were finalized early on and yet they still stuck him in Kanto for whatever stupid reason.