Well, I have to say you gave me more information than I bargained for. I did like the idea of Volbeat, but I don't see Nidoking threatening as much without his Speed boost. Salamence, Jirachi, Celebi, Starmie, Landorus, Terrakion, Dugtrio, Haxorus, Latios/Latias etc. all outrun and have the potential to OHKO.
A BP Chain. I used to play this a long time ago. I was more looking for a single teammate that I can use to pass either Quiver Dance or Shell Smash. BP Chains are nice to pull off, but difficult to keep momentum (especially since Trap Passing doesn't work any more T^T).
Uh, yes, those were my Evs... I would like to avoid Baton Passing Ingrain. It takes up another slot on Smeargle and on top of that, if somehow I'm being walled to death or run into something that can threaten Nidoking (ex: CB Weavile or Sp.D Swampert), there's no way of protecting him. I haven't seen much phasing, so I'm not that worried about it.
In addition, a new question: has Moxie Heracross been released yet? And if so, has it had any affect on the metagame?