Improve my Pokemon Black team?

Now, I am not too good at Pok�mon, mostly only good with Diamond, but your team seems pretty well rounded, with some useful abilities in there. I would rate this about 8/10, but think about teaching Hydreigon some Dragon Moves, to help take down Dragon pokemon easier, as if Jellicent is taken down, Ice Beam cannot be used. Getting a good dragon move would be useful, like Dragon Claw or something similar. Possibly swap out Darmantian and get a stronger pokemon. One with fire moves would be good, like Rapidash (Just an example) or something similar.