>>18256359you mean air temple?
iirc someone did suggest a post game temple in the clouds that could only be accssed from a platform in the desert where a congregation of Necronite use their powers to telaport the player there, after getting there it becomes accessable through the 'fly' menu.
It would be empty except for a bunch of wild flying/grass types and there would be computerized holographic trainers who are the remaining memory files of a lost civilization.
There would be some sort of treasure there, and possibly an encounter with the wind spirit.