Hydreigon would honestly probably usurp Kyurem-B's position as a mixed Wallbreaker with Protean. One of the biggest OU viable movepools, a bit faster (not much in that range, but it saves on creeping), and Protean's boost will bolster his physical hits (mostly reserved for stuff like Chansey or Tyranitar admittedly) more than enough. One limitation being that Kyurem's high natural Attack means he can be oriented to either on his mixed sets, whereas Hydreigon would almost always be specially oriented.
Aromatisse I'm not sure what to make of this. On the one hand, a Toxic immunity and an even greater resistance to Fighting, along with Grass resist and Poison neutrality are much appreciated, actually lets it take a hit from Venusaur to get a Wish off (252+ SpA Mega Venusaur Sludge Bomb vs. 252 HP / 4 SpD Aromatisse: 169-201 (41.6 - 49.5%) -- guaranteed 3HKO after Leftovers recovery).
On the other hand, that Ground weakness and Psychic weakness in particular are serious problems for it, since it's now an easy target for the Latis, Scarf Lando-T hits it hard enough to break, and almost any Dragon using EQ for coverage like Altaria. The biggest problem is Clefable: while Aromatisse would have a reason to be used over it, it's still not necessarily an equal or better choice for teams, lacking reliable recovery and being limited to Cleric roles
Granbull At a glance, I wasn't sure on this thing, given the lack of recovery and Resttalk dependence proved an issue for Ampharos, a much more naturally bulky mon. Then I remembered Granbull's typing and saw this
252 Atk Tough Claws Mega Metagross Meteor Mash vs. 248 HP / 232+ Def Fur Coat Granbull: 187-222 (48.8 - 57.9%) -- 59% chance to 2HKO after Leftovers recovery
+1 252 Atk Tough Claws Mega Charizard X Flare Blitz vs. 248 HP / 232+ Def Fur Coat Granbull: 172-203 (44.9 - 53%) -- 0.4% chance to 2HKO after Leftovers recovery
I know he can't do much back, but that kind of Physical bulk is ridiculous (536 effective stat), on par with standard tank Mega Aggron, arguably better typing, Leftovers, more HP, and no Mega slot. All things considered, I wasn't WOWed immediately by this slate, but Granbull is the one I'm most interested to see in action and explore.
Poliwrath to wrap up seems like it'd be a really annoying mon to face. Dynamic Punch and 100% Hypnosis essentially means the opponent is waiting through hax to hit him with anything but a Ghost type (after Sleep Clause). The one trouble I see is low Speed and Attack holding him back for his other moves, which don't have the same high BP, and PuP as his only boosting move. He does have a special movepool that would like No Guard (Focus Blast, Hydro Pump, Blizzard), but those only see use under rain, where he'd need SS.