A new Pokémon GO Stamp Rally is now available to all players, this time set in Nagasaki. Trainers who complete the Nagasaki GO Stamp Rally will earn an encounter with an Ampharos that features a special Nagasaki Location Background. It’s a fun way to explore the region and add a unique Pokémon to your collection. Whether you’re visiting Nagasaki or joining in remotely, this event offers a fresh incentive to get out, play, and celebrate another creative regional feature in Pokémon GO.
Source: Official Pokémon GO blog
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