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Province of British Columbia tbqbhwyfamsmh
It's got the Okanagan desert, the Cascades and Rockies, huge coastal rainforests, lots of opportunities for islands (Haida Gwaii, Vancouver Island, Gulf Islands).
Vancouver has has a few landmarks that could be easily pokemonized: Granville Island for shopping/, Pacific Rim Hotel as some sort of marathon battle challenge, Davies/Granville street for shopping/battling, East Hastings for villain gang turf, then there's Gastown, Chinatown (Kantotown?), Capilano Suspension Bridge, Aquarium (Water type gym?).
You could also easily weave in the First Nations into the story/world, which would add some variety. Maybe the friend character (may/brendan) could be native?
For starters, you could have a whale/porpoise type thing (water), an elk (grass) and maybe a cougar/mountain lion (fire).