Quoted By:
This isn't entirely about a gym leader, per se, but it's close enough.
>Rock type gym
>Gym is themed after a shoddy, low-budget stage play
>Gym starts out in a mostly-cardboard underwater setting
>Trainers fossil Pokémon that would be found from the Cambrian period to the end of the Devonian period, like Kabuto, Anorith, and Lileep. Relicanth can also be there.
>Make your way to an "ADVANCE TIME" switch.
>Curtains close
>The curtains shake, loud noises can be heard, and perhaps some other effects happen to show that something is happening
>Curtains open
>Cardboard tropical setting, clearly dinosaur-times
>Fight dino-mons (and Areodactyl) and make your way to another time switch
>Brief recreation of the K-Pg Mass Extinction made entirely out of cardboard
>Curtains close and open again
>Background is a more modern setting
>Made of cardboard, of course
>Straight path to gym leader
>Gym leader is a paleontologist. Think less Roark and more pic related
>Very obsessive and tends to ramble, seems almost crazy
>Talks about how he wants to teach the youth about the wonderful world of paleontology
>Team is mostly fossil Pokémon, with a possible mining-based Pokémon, if it exists in that Generation
I think I posted this a few months back, but I like the idea a lot.