I agree wh Marowak being dark, he has a right to be, hmph, i know i would seek revenge after my mother died for NO GOOD REASON, i mean, put yourself in Marowak's position, you're tired of morning your dead mom the rest of your life, you want REVENGE on the world because it is the will of nature that your mother die, wich is unfair for you, thinking about it, i can see where marowak's ententions are coming from.
when it evolves it's filled with hatred, for the world, it wears the skull of it's mother because that's its only reminder of her, it's not like he has a picture of her, then, he takes bones from the graveyard and swears he will train himself to be a warrior and avenge his female ancestors, afterwards, we catch him and he learns all sorts of cool moves, the moral is, he's angered, and twisted, i mean what kind of little dog wants revenge on the world with a skull as a helmet and bones as weapons, he's dark...
as for Gliscor i compeletely agree with him too, for obvious reasons.
not sure about Zubat, the fact that it lives in caves could be a darkpoint (that's right, this Xilster made another new word) but i'm sure everyone agrees that golbat=joke, i only have a golbat in my bunch so it can evolve to Crobat, i love Crobat.