John GBC is a Gameboy and Gameboy Color emulator for Android that costs $2.99.
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Pro Zero advertisements and no need for an internet connection
There are no advertisements in the app taking up precious screen space and there is no need for an internet connection to use the app.
Pro Wide range of controller support
Wiimotes, bluetooth HID controllers and MOGA controllers all work with this emulator, which is a great feature to have when so many games really require the precise input that a controller offers.
Pro Supports game cheats
Game Genie, Game Shark and PAR cheat codes work with this emulator and it's library of supported games. Which can be good for users that want things like unlimited lives or infinite in game money.
Pro Fast forward and slow down functions
The fast forward and slow down function allows users to easily speed up cutscenes and slow going portions of the game as well as slow down sections that users would like to view longer.
Con Unable to view current memory usage
Viewing memory usage can be helpful in Pokemon games as the Pokemon with higher IVs use more memory. It is basically an easy way to get good Pokemon. Sadly this emulator does not support such a feature.