>>56759482Yes. You might be thinking of Shinjuku Jack, a Porygon‐like trainer.
His data and that of Silph Co. Chief still remains in the game data.
Ken Sugimori has also shown the original concept art of the scrapped first gymleader from the Viridian Gym. You were meant to battle him during the very beginning of the game. That and the bomber soldier Blaine, which shown as a disguise of Blaine in the manga and 4koma.
