I read this wiki a lot so I decided to join the forums, so here am I =D.
I found this shot, which can't be fake:
We can see it uses the normal 3D perspective as the gyms, but in the final version the camera is locked, thus the appearence is the same of a common parallel perspective as below (sorry for the quality, taken from my DS using my webcam).
I think the game would have been a lot better with 3D appearence on all the places. What do you think?
(For reference, that is the Pokétch company, in Jubilife)