They show the double battle against the 2 veterans before the Battle Tree so I'm guesing the Mimikyu & Gigalith were just for the trailer. Since those are the last 2 regular trainers in the deepest post game area.I'm also interested in this. Will we finally have a high level area?
SM also had a really high level wild Gigalith in one of its trailers but you can't even find Gigaliths in the wild, even through SOS.
Although, if you want to get technical, they did raise the levels. The woman's Comfey went from level 61....to level 63!