First off, replace Dusknoir with Dusklops and give it the Evolution Stone. The moveset can change a little, because he needs Shadow Sneak for low HP.
Crawdaunt - Awesome moveset, but I would go with a reliable Waterfall instead of Crabhammer and Crunch instead of Night Slash.
Aggron - I don't like it for obvious reasons, plus you can't get many good coverage. Your moveset is good, seeing how heavy this thing is, but it's a predictable moveset, although you can't get any better with Aggron.
Ursaring - Again, predictable but differant from the Aggron moveset, because you Actually have really good coverage.
Beheyeem - Good moves, Nothing to change.
Elektross - Why Gastro Acid? switch it for Flamethrower to take Ferrothorn down.