Smash hit Pokemon Go was the most-downloaded iOS app worldwide in 2016, despite having only launched in July.Pokemon Go rose to immense popularity and was Google's top trending search term of 2016. Developer Niantic recently held a holiday event for Pokemon Go featuring newly added Pokemon and a special Pikachu wearing a Santa hat.Also high on the 2016 downloads list was Super Mario Run, Nintendo's endless runner that brought Mario to mobile.