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 currently 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 Pokeball 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 36 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, but can be transferred to Pokémon Sword and Shield via Pokémon HOME. In Mew's case, the player may use newly-purchased Poké Ball Plus, and in Galarian Slowpoke's case, the player has an opprotunity to catch one as of Patch 1.1.0. They may also be included in Pokédex expansions in the future.
The following Pokémon are expected and confirmed to be included in the patches associated with the release of The Isle of Armor and The Crown Tundra. After downloading the associated patches, players can import or trade for these Pokémon regardless of whether or not they have purchased the Pokémon Sword and Shield Expansion Pass.