>>28669911OP here, thanks a lot!
I had a concept for the gym town wherein it is a spooky Area 51-styled place. The gym leader is (loosely based on) a US military member that utilizes Psychic Pokemon related to strange unexplained events. In a further departure from the standard Psychic Gym. she wouldn't be a cool and collected mystic like Sabrina or Olympia, but an excitable conspiracy nerd.
I should have added Sigilyph instead of Starmie, but...
>ClaydolSpooky spirit doll
>BeheeyemMandatory alien in Area 51
>GalladeSuperhero/mutant powers
>JynxYuki-onna spirits
>HypnoObviously hypnosis
>StarmieStrange space phenomena
I also considered Alakazam for ESP, but that seemed too boring and expected for a Psychic Gym.