I came late in the day to the news that
Google Maps is now populated by Pokémon, and I've been at it ever since, zooming in on places of interest in the hope of catching a monster. (Some of their hangouts are brilliantly appropriate: find Ghost types near famous opera houses, and a Luxray at Battersea Power Station.)
I've caught 76 out of a possible 150 and should probably go to bed soon.