Everything is City-States, with Cities competing for the right to have a Pokemon Gym because they bring economic stimulus. A Gym Leader must come from the town in which their gym is located. A gym can switch locations if the Elite Four give a challenger city the Go ahead to send their champion to face another city's gym leader. Gym leaders have a wide range of pokemon, and save their best for Champions.
North American Gyms: Mexico City, New York, Chicago, Toronto, Montreal, Vancouver, Phoenix, and Orlando. Los Angeles had one until a pokerus outbreak made the city unsafe, and the gym was moved to Montreal.
South American Gyms: Guatemala, La Habana, Ciudad De Panama, Tegucigalpa, Buenos Aires, Rio De Janeiro, Lima, and Bogota
European Gyms: London, Paris, Madrid, Berlin, Rome, Moscow, Stockholm, and Vienna
Asian Gyms: Tokyo, Mumbai, Seoul, Jakarta, Karachi, Beijing, Tehran, Istanbul
Oceanian Gyms: Sydney, Auckland, Melbourne, Brisbane, Perth, Adelaide, Port Moresby, Suva
African Gyms: Lagos, Cairo, Casablanca, Cape Town, Nairobi, Kinshasa, Dakar, Abidjan
And those are the Global Organizations. Thoughts on what I have?