The streets of Sydney were taken over by hundreds of people glued to their phones as they captured Pokemon monsters in a battle to "Catch 'Em All".

Just days after new app Pokemon GO launched in Australia, hundreds of Pokefans joined together on Sunday to find their favourite pocket monsters throughout Sydney, with the app's use of GPS and internet services, which turns the whole world into a Pokemon region map.

Once the app is downloaded, players can customise their Pokemon trainer name. Through the phone's camera, the cute characters are animated into your real surroundings, with players swiping vertically to catch them.

The interface on their phone will show person walking on a Google Maps-type layout through the phone's GPS.