Despite what you may think, it's still possible to add Persian and Cofagrigus to your Galar Pokédex in Pokémon Sword and Shield.
Meowth and Yamask normally evolve into Persian and Cofagrgius.
Yet, in Pokémon Sword and Shield, both Meowth and Yamask have new Galarian forms and new second evolutions; Galarian Meowth evolves into Perrserker, while Galarian Yamask evolve into Runerigus.
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How to get Persian in Pokémon Sword and Shield
The first order of business in adding Persian to your Galar Pokédex is to catch a Galarian Meowth.
You only can find Galarian Meowth on Route 4, which sits just before Turffield.
Once you have a Galarian Meowth, head to the Turffield Stadium. There you'll find a boy who wants to trade his Meowth for a Galarian Meowth.
Agree to this trade and then select the Galarian Meowth you wish to trade, in return the boy will give you a regular Meowth.
Now all you have to do is level up this new Meowth to level 28 and, unlike any Galarian Meowth, it will evolve into Persian.
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How to get Cofagrigus in Pokémon Sword and Shield
If you want to add Cofagrigus to your Pokédex, you must first catch a Galarian Yamask. You can find Galarian Yamask on Route 6, which is between Stow-on-Side and Hammerlocke.
With your new Galarian Yamask either in your party or a box, head to the Pokémon Stadium in Ballonlea.
Inside the Ballonlea Stadium, you'll find a girl dressed as an Eevee who wants a Galarian Yamask.
Agree to trade Yamasks with her and you'll receive a regular Yamask in return for your Galarian one.
All you have to do now is train this new Yamask up to level 34 and it will evolve into Cofagrigus, filling in your missing Pokédex entry.