I can only assume that this is for one of the 5th gen games, since you didn't give us a whole lot of information to work with here. I'm not much of an expert in team building, but you might want some more diversity in your team, as you've already got 2 Dark types in Scraggy and Krokorok.
Either way, I'll move this over to our
In-Game Team Help board for you, since Pokemon General doesn't deal with any questions specific to the Pokemon games.
MOVED.