Minnow
If you're gonna dig, dig to the heavens!
Dark type is the Aku (Evil) type in Japan. A light type makes no sense.
Well then couldn't a Light type actually be, like, good, or pure in Japan, to match with evil, but when they translate it they make it Light type to match with Dark?
EDIT: ie, instead of making a 光 (Hikari) type, make it a 善 (Zen) type, then translate it into Light, fitting with Dark.