arkham city is a floating island in the insmouth reagion. it is "home to many strange things" as henry armatage says.
it is the best place to train dark and ghost type pokemon, being the greates link to the nighmare realm and distortion world. the dimentional fabric surrounding this city is very weak, letting in distorted air and pokemon from those dimentions.
miskatonik university/pkmn gymEdit
miskatonic is the best university to study medeval mediphisics, theology, "special" biology, and other professions of the paranormal. it also used to double as a pokemon gym, till the gym leader, H.P. Lovecraft, was found dead and his pokemon found missing.