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LONDON, ENGLAND - JULY 15: A Raticate, a character from Pokemon Go, a mobile game that has become a global phenomenon, on July 15, 2016, in Downing St , London, England. The app lets players roam using their phone's GPS location data and catch Pokemon to train and battle.The game has added millions to the value of Nintendo, which part-owns the franchise. (Photo by Olivia Harris/Getty Images)