Pokémons appear exclusively in their area. Rarity listed is how common they are in their respective area. One per evolutionary line. In this post you can find Pokémons by rarity!
In the main series of Pokémon games, it’s always been pretty clear what sorts of Pokémon will appear where: Water types appear in water, Electric and Steel types appear in industrial locations, Fire types appear in warmer areas, and it goes on thusly. Overall, Pokémon appear where you’d probably expect them to, but does this also apply to Pokémon Go?
Players have been trying to figure this out, and Reddit user RotomGuy thinks he has the answer with his Pokémon Go rarity chart:
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