If you say "t's opposite of dark" You should really know dak is more like a thief/prankster type and not an absence of light type.
doesn't have to be anything to do with Dark. And the Whole Fighting/Dark thing makes no sense, Surely an evil fighter would win against an honourable one? A swift kick to the pokeballs and GG.
Have you ever seen any type of anime, or otherwise Japan-inspired children's TV show? Power Rangers? Read a comic book? Hell, have you ever seen a Disney movie? The person who fights in a sneaky, underhanded way almost always loses to the honorable hero.