I haven't tried Ubers this gen. Mainly because I most of my competitive battling has been done in-game, and I didn't know Xerneas always had three perfect IVs, that it could be SRed, or that it was allowed in Free Battles. I haven't put a team together on Pokemon Showdown for this Generation yet. 

Now an Uber I really dislike, Blaziken. When I use it, the thing dies from recoil damage before it can do something to the opponents next Pokemon. When someone else uses it, they sweep my whole team. Am I doing something wrong here? :/