The latest trailer for Pokémon Let's Go Pikachu and Eevee reveals the 3D models and concept art for characters that appeared in the original Pokémon Red, Blue (and Green), and Yellow. You can see a bunch of the gym leaders in both 2D and 3D forms like Lorelei, Bruno, Agatha, and Lance, the villain Giovanni (who might be Ash's mom?), as well as the Elite Four that you fight at the end of the game.
Pokémon Let's Go Pikachu and Eevee releases November 16.