In Pokémon Sword and Shield it's possible to receive a Pikachu and Eevee simply from having a save file for either Pokémon: Let's Go Pikachu! or Pokémon: Let's Go Eevee! on your Nintendo Switch.
Obviously you'll receive Pikachu if the save file is for Let's Go Pikachu! and Eevee, of course, for Let's Go Eevee!
What makes these two Pokémon worth collecting, however, is their ability to Gigantamax.
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How to get a special Pikachu or Eevee from playing Let's Go in Pokémon Sword and Shield
You can receive your free Pikachu or Eevee very early on during your playthrough of Pokémon Sword or Shield.
On your first journey to the city Motostoke, you'll find your train derailed by a herd of Wooloo wandering onto the tracks.
This will leave you in the train station in the Wild Area, which is also where you will receive your free Pokémon.
To the left of the barriers leading to the train is a man with brown hair, wearing a grey jacket and a blond haired woman, wearing a while shirt.
Talk to the man if you played Let's Go Eevee! and the woman if you played Let's Go Pikachu!
They'll both recognise you as having 'Let's Go experience' with either Eevee or Pikachu.
In the hopes of giving another such experience they'll gift you the Pokémon that corresponds to the version of Pokémon Let's Go that you played.
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.
Special Pikachu and Eevee Gigantamax ability in Pokémon Sword and Shield explained
The Pikachu or Eevee you receive isn't just special because you get it for having a Let's Go file on your Nintendo Switch.
No, the Pikachu or Eevee you receive also has the ability to Gigantamax in battle. The downside, however, is that you can't evolve either of these special Pokémon.
Gigantamax is a special ability that only some Pokémon have. When it occurs the Pokémon will grow in size and their power will increase.
In this new form, the Gigantamax Pokémon will have access to a special G-Max Move, which is exclusive to that specific Pokémon.
Due to their inability to evolve, the special Pikachu or Eevee you recieve is basically a collector's item. You can have some fun experimenting with the Gigantamax form, but neither one will have any long term usefulness on your team.
You may find Pikachu useful in the second, water-type based gym, but, other than that, if you want either Pokémon to be a permanent feature on your team, you're better off looking for one you can evolve.