New pokemon idea

I'm sure that I'm not the only one that has thought of this and it may be late to add a new typing but what if they made a game with game centered around a new typing being the light typing? Like the apposite of dark type so it would be weak to dark but most physically moves won't be affective but most special moves would be super affective or anything else, I just would love to see a light typing with a new legendary that just forms from science like how Mewtwo did but it was an accident like they trying to make a super light ray to hurt another legend pokemon that's dark type to you know outshine the dark but instead the concentration of light built a new legendary that is made of pure light, it can even be a new series for the pokemon anime of ash or something searching a brand new Island that appears out of nowhere because of the new light legendary or something