Personally, I think that you shouldn't run a stat reducing move such as Superpower along with Bulk Up since it ends up being counterproductive. When you are running Bulk Up, it's for the sake of building staying power, when you are running Superpower is mostly for the sake of Hit & Run.
You also forgot to mention Mega Rayquaza shuts down Mega Mence, do not try to place this new Dragon/Fighting pseudo-legend with the the ubers, he will get wrecked very very badly seeing as MegaQuaza completely destroys everything in it's path, even with fairies on the field (Dragon Ascent), I'm glad that Mega forms will be returning for Sun and Moon, but they seem to be late game this time around (and hopefully far easier to get, although I'm going to laugh if MegaQuaza's the first one you get seeing as it only needs to learn one move for it to Mega Evolve).
I wasn't trying to place it with the likes of Mega Rayquaza, but it really isn't necessary because Mega Ray Ray is on a league of it's own and banned in most formats. This guy really has no business facing it to begin with.
Also, I don't think Mega Rayquaza shuts down Mega Mence. I would say that Megamence has a slight advantage for having a higher base speed, so if facing each other right off the bat without any of those getting prior boosts, there is a chance Mega Salamence would win:
252+ Atk Aerilate Mega Salamence Double-Edge vs. 0 HP / 4 Def Mega Rayquaza: 303-357 (86.3 - 101.7%) -- 12.5% chance to OHKO
252 SpA Mega Salamence Draco Meteor vs. 0 HP / 0 SpD Mega Rayquaza: 402-474 (114.5 - 135%) -- guaranteed OHKO
Mega Rayquaza can OHKO back with Outrage but it's not going to move before Salamence most of the time. So unless Rayquaza survives the Double Edge and uses Dragon Dance in a prior turn before Salamence shows up or Mega Mence misses Draco Meteor, the matchup shifts slightly to Salamence's favor.
By the way, the new trailer just showed up:
I like Kommo-o more now that I've seen it's 3D model in action. Oh, and Silvally, Type: Null's evolution, is modeled after Arceus and you can see the reference in the name of it's ability, RKS System.
RKS: Ar-Kay-Us
It functions basically the same as Multytype.
Oh, and Alola Muk looks better in motion than in pictures. I like that form way more than the original.