これだけ残念だな

"Last year, I heard from sources familiar with the project that the game would indeed be set in Kanto and be a sort-of remake of Pokémon Yellow.
The visuals would be familiar and reflect the project's origins as a higher-resolution version of 3DS games Sun and Moon"

https://www.eurogamer.net/amp/2018-05-16-pokemon-switch-set-in-kanto-starring-pikachu-and-eevee-leaks-suggest

つまりこの画像はガチ
https://cdn.gamer-network.net/2018/articles/2018-05-16-11-02/Pokemon_Nintendo_Switch_Leaked_Image_640x353.jpg