Originally Posted by Fat Bruno Magno
176 Spd doesn't looks useful, and with Ice Beam it can easily dispose of Rayquaza and others. Wacan Berry in Uber, where Thunder is so abused, isn't so helpful
Mmk, I think I can pretty safely say everything there is wrong. The Spee EVs allows him to outspeed + Natured Base 90's, which are quite common in Ubers. More so, a +3 Surf does about 65.9-77.6% to a Naive Rayquaza, having a 25% chance of an OHKO w/Stealth Rocks. More so, if anything the abuse of Thunder in Ubers even greater warrants the use of Wacan Berry.
As far as the team goes, it looks pretty solid. I would try running a physically defensive Giratina over a specially defensive one, as your team as a whole doesn't really switch in very well to Extremekiller Arceus or Groudon. Moreover, I would suggest opting Surf out for Aqua Tail on Palkia (obviously with a Hasty Nature) in order to better check CM Mewtwo. Lastly, I would suggest running CS Darkrai over the sashed variant, as it does allows him to outspeed Scarfogre, cripple a wall and sweep late-game, which imo is much more valuable than just dyeing off.
Anywho, that's just my two cents. Gl and I hope I was of some help