From Autumn Yates at highya.com:
We’d been searching for ten minutes when the screen showed a rustle in the grass to our right. My guide became instantly excited—would it be a Charmander? A Jigglypuff? We were about to find out.
Then, just as we were about to close in on the spot, the Pokémon disappeared. These creatures were proving to be elusive. Ungluing my eyes from the screen, I realized that Pokémon might be hard to spot, but players were everywhere.