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.
With it finally in the wild, here's how to start the Crown Tundra DLC and our full Pokémon Crown Tundra walkthrough. Plus, here's how to catch Calyrex, Glastrier and Spectrier, the Regieleki and Regidrago puzzle solution and Regirock, Regice, Registeel locations, details on how to catch Legendary Birds Articuno, Zapdos and Moltres in the Crown Tundra, the Ultra Beasts and Necrozma adventure, Dynamax Adventures, including the legendries you can catch on these adventures, and the new Crown Tundra Pokédex and returning Pokémon explained. For Isle of Armor players, here's how to find the Slowpoke, where to find Max Mushroom locations, and how to get Kubfu, become best friends and evolve it, plus all Diglett locations too! For the base game, here's info on the ability to transfer Pokémon to Pokémon Home, the Wild Area, lists of all TM locations and TRs, all Galarian forms and finally our main Pokémon Sword and Shield walkthrough for the whole game.
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.