Do you think that there should be a new type of pokemon?
like Dark and Light?
Dark would be super effective on grass and be weak to fire and light.
light would be super effective on dark and weak agaisnt rock.
also, ghost would be weak to light.
There already is the Dark-type for Pokemon. My thoughts are that it's not necessary to complicate the already well-known type/effectiveness system. The meta-game should be as simple as possible, so it can be enjoyed by players of all ages. Not to mention that "Dark" and "Light" are a little too reminiscent of Yu-Gi-Oh.
By the way, try to make your thread titles more descriptive. Just a tip.