Masuda said: “If a Pokémon doesn’t appear in Sw/Sh, it doesn’t mean it’s not in future games.” We still have a National Pokedex, but not in Sw/Sh, that’s all.
No, what this means is that they will keep doing thisLets say SwSh has 400 old Pokemon, then Pokemon Spear will be the same thing with a new legendary and with 300 old Pokemon absent from SwSh replacing 300 Pokemon SwSh had