PokeScanner by PokeSocial shows nearby Pokemons on a map and is useful while playing Pokemon Go. It collects information from various sources and sorts them based on the likelihood of that data point being correct and displays the Pokemons on the map along with the time before they disappear. It was available earlier on Google play but has been removed some time back but the Apk is available on drive.
It should be helpful for Pokemon Go players and many players have reported catching Pokemons using the app. Also, since it does not require any login, there are no chances of getting banned.
PokeSocial