What would your gym be if it couldnt be based on typing? For instance would you have an entry hazard gym? What about minimize or baton pass as your theme? Mine would be a Perish Song gym.
http://replay.pokemonshowdown.com/anythinggoes-315657467>this battle is about 30 turns and each of us end up with fainted pokemon at the end. i get to keep badge though, rules claim me as victory if opponent also has no pokemon 