Not really --- it's in NU without an OU analysis section. It's easily killed by OU's many Steel types (e.g. Excadrill, Ferrothorn, Melmetal) and various other offensive threats. The Tapus are all better than it --- Koko and Lele for offensive roles, Fini for defense, and Bulu if you like losing. Diancie is excellent in NU, but it struggles in OU.
Hope I helped!
