What Pokemon Are Unobtainable?

Unlike previous Mainstream Pokemon Games, not every single Pokemon was coded within Pokemon Sword & Shield. Instead, only the new 81 8th Generation Pokemon, along with 319 Legacy Pokemon and 35 Transfer Only Legacy Pokemon can ultimately be obtained in Pokemon Sword & Shield. If a Pokemon is not found within the 400 Entry Galar Region Pokedex and is not one of the select Transfer Only Pokemon, it effectively cannot be obtained in these two games. Roughly, that's over 450 Pokemon that cannot be found. That said, however, this does not mean that the Pokemon Company will not release an update some day down the road that will allow trainers to find every known Pokemon within The Galar Region.