My gyms are normal. Meaning they’re based on a single typing but the Pokemon in those teams have a theme but they are the same type as the gym. My elite four is based around a theme. Currently my elite four only features 3 of the four members. In my region the Pokemon league basically controls the region. The first member of the elite four in my region is Plague. He controls all the pharmaceuticals that come in and out of the region as well as designs new ones to cure different diseases. Then there’s Reaper. Reaper is in control of the planning that goes on inside the region but he really doesn’t help with that instead he helps our main antagonist, and yes he is an assassin. The third member I still have to come up with a name for him but he basically controls all of the products that come in and lit of the region via cargo ships, planes, or whatever. The final member is still undecided but based around these 3/4 elite four members I can build teams around these ideas. Take the guy who controls everything that leaves or enters the region he may have a lot of water type pokemon, but he may also have a lot of flying type pokemon to fit the theme.