Dozens of wild Pokémon have taken up residence on streets, amidst forests and atop mountains throughout Google Maps. To catch 'em all, grab your Poké Ball and the newest version of Google Maps for iPhone or Android. Then tap the search bar, "press start," and begin your quest.
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Here is a wiki with an updated list on where to find all the Pokémon you are looking for. Link
Also we are assuming that this will be going away from Google Maps on April 2nd. Comment how many you've gotten! Is there a surprise for getting all 150 Pokémon?