Rate my Pokemon Diamond Team!?

that is a good team but the Furret is letting it down i would recommend that you change it for something much stronger such as a Garchomp or Tyranitar. Also it is a bad idea to teach your Electivire Rain Dance go for Protect if you want i move that doesn't attack or if you go for a attack i suggest getting a heart scale and making it remember Fire Punch which it would have learned at level 1.