Google Maps released an April's Fools Day Prank when users were able to catch 150 Pokemons using google maps. Yet it turned out that users were very much able to "catch 'em all" Unfortunately this lasted only for several days and the most recent update does not allow that function anymore. :( For more information, check out this awesome YouTube video:
www.youtube.com/watch?v=4YMD6xELI_kIt is proposed that Google should make the Pokemon Challenge available for download again.