From Bulbapedia, the community-driven Pokémon encyclopedia.
This is a list of Pokémon in the order dictated by the Galar regional Pokédex, meaning that the starter Pokémon from Galar will appear first, followed by Pokémon native to the Galar region. There are 400 numbered Pokémon in the Galar Pokédex. More Pokémon are planned to come to Pokémon Sword and Shield via patches released to coincide with the release of the games' two expansions, in which the new Pokémon will be included in the The Isle of Armor Pokédex and The Crown Tundra Pokédex, respectively.
Only Pokémon in the Galar, the Isle of Armor, and the Crown Tundra Pokédexes can be transferred from Pokémon HOME to Sword and Shield. These include event Mew when transfered from Poké Ball Plus, as well as Alolan Forms, such as Alolan Meowth, non-Galarian counterparts, such as Mr. Mime, and other missing forms, such as West Sea Shellos and Gastrodon. There are currently 30 known foreign Pokémon.
List of Pokémon by Galar Pokédex number
#001 - #051 Grookey - Cinccino
#052 - #101 Bounsweet - Quagsire
#102 - #151 Corphish - Cloyster
#152 - #204 Feebas - Sylveon
#205 - #251 Applin - Weezing
#252 - #300 Bonsly - Torkoal
#301 - #350 Mimikyu - Frosmoth
#351 - #400 Clobbopus - Eternatus
The following Pokémon are not part of the Galar Pokédex, Isle of Armor Pokédex, or Crown Tundra Pokédex but can be obtained in-game through either Dynamax Adventure, in-game events, or transferring to Pokémon Sword and Shield via Pokémon HOME. In total, there are 80 Pokémon obtainable in Pokémon Sword and Shield that are not listed in any in-game Pokédex.