Unfortunately, only Flareon, Vaporeon, and Jolteon are Gen 1. The other ones are not available in Pokémon: Let's Go! Of course there will be future games where the other evolutions will be included.
Unfortunately, only Flareon, Vaporeon, and Jolteon are Gen 1. The other ones are not available in Pokémon: Let's Go! Of course there will be future games where the other evolutions will be included.
RE: New Game For Nintendo Switch: Pokémon: Let's Go! (Part 1)