“We currently don’t have plans to make the Pokémon that are missing from the Galar Pokédex available in the game,” Masuda said. “This is an approach that we want to continue with in future Pokémon games. Up until now it hasn’t been possible to encounter every Pokemon in every game, so people had to transfer them from old games to the new game, by using Pokémon Bank as an example.”

Damn I wonder why they would not have all the pokemon on launch and release them over time as paid DLC. Seems like a weird creative decision to me idk.