It’s a yellow pocket. Originally, “yellow” in the first generation corresponded to Pikachu. Lets Go reproduces Huang, and it makes sense to use Pikachu as the cover. It feels like lets go will not become a series, because its trademark on the official website is: "Pokémon: lets go Pikachu", and "lets go" is similar to crystal and bright. Legends have an independent series label. The trademark on the official website is: "Pokémon Legends: Arceus". So either remake "Crystal" or make a new "Legend", it won't become lets go