No National Dex in SwSh, ie not all Pokemon are available in SwSh. Only Pokemon listed in the Galar pokedex will be in. In every prior Pokemon game, every single Pokemon was at least programmed into the game and usable, even if they couldn't be caught in that region. However, this is not so in SwSh, as only Pokemon in the Galar dex are in the game. Ie, if Magmar isn't in the Galar Pokedex, you can't get Magmar in SwSh, period. Not through importing, not through hacking, nada. It literally isn't in the game. And from what we've seen, we'll be lucky if you can even get half of all Pokemon in SwSh. At the moment, it seems like there might be about 300 Pokemon in SwSh.
There is absolutely no justification why Game Freak can not implement all of the Pokemon.
Really, this is just the last in a long chain of grievances the vocal Pokemon community has had for a while. The games have been consistently declining in quality since Gen 5.
Degradation in world design.
Removal of gameplay features.
Continued