Does “Pokémon Go” have a second act? The mobile phone app was an instant hit when it debuted in July. Crowds stampeded after a Vaporeon in Central Park and people fell off cliffs playing it in California. At an Apple event on Sept. 7, Niantic CEO John Hanke said 500 million people had downloaded the game in just two months. It was the first mobile game to go mainstream in a big way since “Candy Crush” in 2014 or “Angry Birds” in 2012. It was also the first to
