I was wondering, Can a stage 1 non-dark pokemon evolve into a stage 2 dark
pokemon. And can a dark pokemon evolve into a non-dark pokemon

-pokefan-

No.  All basics are non-dark, so you can evolve any basic into dark or non-dark, or use a breeder the same way.  A dark stage 1 can not go to a non-dark stage 2, or vice versa.

Scott