Null is the Pokemon Professor, however in this region he's actually documenting how people's demented nature and degeneracy are reflected in the Pokemon they choose.
Gunt is definitely too big for a gym and is Elite 4 or Rival/New champion. Chris is definitely previous Champion post Elite 4, like Red in Gold and Silver.
I'd also suggest the idea of going against the old trope of type themed gyms, instead have reach gym have a theme that allows a multitude of typing.
For example: For the Tranny gym, they all use Pokemon with a sexual dimorphism. Easiest case they have the wrong sprite for they gender, what would be really great it's of they have wounds reflecting their genders forcibly being changed.
An example that I'll try and make a visual of later. Male Pikachu have the tail your familiar with from the anime. Female Pikachu have two lobes on the end, like the top of a

. Tranny Pikachu would have a V cut into their tail, with blood, and the top not rounded off into lobes.
Edit:
View attachment 2896170
Female on the top Left, Male on the Top Right, and Tranny Pikachu on the bottom.