Sorry for discusing Celebi, just to answer quickly.
Originally Posted by Fat alexwolf
As for SpD Celebi, any of Perish Song / Heal Bell / T-Wave are viable in the last slot, but Perish Song is generally the most useful move, and not only for stall teams. Perish Song allows Celebi to deal with almost every CM user in OU, and some other set-up sweepers, such as SubDDNite, which is huge. Killing the last mon is just a sweet bonus that defensive teams love and doesn't mean that Perish Song is only for more defensive teams.
For examle when i used Celebi with Hippowdon and CB Tyranitar i didn't need Perish Song, as Hippo deals with CM Jirachi and SubDDNite, while Tyranitar deals with CM Latias and CM Reuniclus, so i used T-Wave in its place. I also like to use Heal Bell Celebi alongside Rest Heatran and/or RestTalk Gyarados (which is a very good mon for defensive teams atm).
Yes, I said that Perish Song is more Stall oriented, but I also think too is useful in Offensive or Balanced teams. I forgot to point out that.
But I think TW>Perish Song in general out of Stall, paralyzing things is more valuable now.
Heal Bell of course is great in Stall teams, specially makes Rest viable in these teams.
Going back to the current discussion, I think Dragonite may be more useful as paralysis(again, I focus on paralysis) spreader. Almost no one expects TW in Dragonite(Surf. Waterfall or Draco Meteor for Landorus in the switch-in)
Hydreigon seems better Mixed than Dragonite right now, with more Speed, more Sp Att and no SR weakness, but Hydreigon's Physical Attack is a bit low for a Wallbreaker, however, it's enough for it's purpose the majority of time.
Dragonite mixed, it is unexpected right now, but maybe isn't worth most of the time.