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Western US: LA is the main city, desert, forest, mountain, and ocean regions nearby. Hollywood themes like XY did with fashion/tv for the villains and champion. Return of the game corner in Vegas. poison/fighting or poison/rock Gila monster, ground/fairy roadrunner, and fire/water sea lion mons.
Southern Europe: Either Italy or Greece or both. Again, mountain, desert, forest and ocean/island areas. Main city has lots of cool ruins. You can explore ruins on the routes as side objectives. Villains are similar to Rose where they are a helpful corpo but it turns out they want to destroy the ruins sacred to the locals. Victory road is either on the Acropolis or Capitoline hill, box legend on Olympus or Vesuvius. Regional golurk maybe a steel cyclops, flying/water dolphin, Kronos/Gaia (or Saturn/Terra) themed box legends.
Oceania: Sydney main city, mainly desert and ocean with mountains thrown in. Evil team are basically bogan team skull/yell. Last 2 gyms/victory road/postgame are on New Zealand. Ground/fighting kangaroo, dark/grass drop bear, psychic/poison or psychic/fighting cassowary, cutesy normal/ghost or normal/grass kiwi, fire/grass hawk (like the ones that carry sticks to spread wildfires over there).
China: Shanghai main city. many routes on great wall. Forbidden city is victory road. Post game battle frontier is Hong Kong. Villains are either Mongolians that act like Team Skull/Yell or the CCP that is basically a hybrid of Aether Foundation and Team Galactic. Ice/Fire tiger, steel/poison Chinese alligator (cause they have an armored belly unlike American alligators and the rivers they're endemic to are basically poisoned now), grass/fighting panda that uses bamboo as a weapon.
That's all I have for now