Anything that doesn't exist yet in National Dex that gets introduced in SV will be available in National Dex. In other words, everything that exists in SV formats will exist in gen9 National Dex formats as well (barring bans of course)Will the release of Pokémon Home affect move sets for NatDex formats?
For example, Staraptor in NatDex already has Roost, Double Edge & Defog. All of which would return in Gen9 with Pokemon Home.
However, the Gen 4 Starters for example don't keep the moves from PLA in NatDex such as Wave Crash on Empoleon, Raging Fury on Infernape & Headlong Rush on Torterra. But they would get them when added to SV with Pokemon Home.