>>48330691>>48330859They won't. Partly because they're using Starters, which are more popular than the shit that's been turned regional and secondly they already established within the series pokémon need many generations living in a new region to adapt regionally, which can't occur with the new starters, as it's said they came to Hisui recently, with Prof. Laverton as he made his way to the region.
Maybe if you'd opened your eyes, you'd realise the actually popular pokémon haven't been touched with the "Regionalisation" brush yet and until one of them is, it's clear what they're using Regionals for.