I'm still not entirely sure what to expect for Ash's third against Wulfric. I'm definitely expecting Pikachu and Greninja, with one of them starring, but I'm torn between Noivern and Talonflame. On the one hand, Noivern is much more in need of a Gym battle, or just an official battle in general, and I think they could definitely give it a win against Abomasnow or Cryogonal; maybe they could even have it star, though I don't think it's super-likely. On the other hand, Talonflame is an extremely obvious choice for the battle and it'd be kind of weird for Ash not to go for it (though as I've said before, I think Talonflame would quite possibly be the fall guy; Abomasnow with Rock Tomb, Avalugg with Stone Edge, etc.). And I expect Noivern to get a good showing at the League anyway, probably starring in a battle, so I don't think it would be too terrible if it got left out of the Gym.
As for the idea of Wulfric using Articuno, I admit, it would sort of make sense. I don't think it's super likely, but it wouldn't surprise me. I would honestly rather they just use his game team, though, Ash has fought Articuno before and I'd rather see Avalugg getting the starring role, or even Mega Abomasnow. Unless Ash uses his sixth and it evolves in battle against Articuno to really complete the trilogy.