Something I'm kind of surprised people haven't mentioned yet on this thread- while it seems to work a bit differently than in Platinum and B2W2, the famous wild Level 100 Magikarp seems to have made a return in this DLC expansion. This seems to apply to all Magikarp in Kitakami, but there's a spot near the Fellhorn Gorge that a few players have already hunted for one of these. Apparently someone even found a Shiny Level 100 Magikarp a couple days ago and their post about it went viral. Aside from this, the naturally spawning Tera Grass Lampent at Level 86 seems to be the highest level of any wild Pokémon in the game so far, although I wouldn't be surprised if The Indigo Disk tried to one-up this at some point.
I'm interested to see if there's any stories you guys have about high-levelled wild Pokémon in this DLC. I believe this to be an error on Serebii's part, but assuming this was true, the level ceilings for many of the Pokémon in this DLC might be higher than we thought. Case in point:
https://www.serebii.net/pokearth/kitakami/index.shtml
I find this information interesting, since the individual encounter tables for each area have all of the correct Pokémon as well as what I'm assuming are the levels for all the Pokémon
before the postgame scaling takes effect. Again, this data may be wrong on Serebii's part, but I find the level data for the Timeless Woods especially interesting since apparently there's also the possibility of finding wild Pokémon upwards of Level 90, and by extension a shot at a Level 100 Snorlax. I doubt this is actually true, though.