John GBC Lite is a Gameboy and Gameboy Color emulator for Android devices which allows you to play almost any game for those portable consoles on your mobile phone. As is always the case with this type of application, John GBC Lite doesn't come with any games. Instead, it allows you to enjoy the games that you put on your phone's memory card, something that you can do relatively easily.
The emulator is perfectly compatible with most games for the console, including Super Mario games (some of the best games in the saga are for GB and GBC), some Final Fantasy games and even Pokemon games. All of them run perfectly without any glitches at all.
Even though John GBC Lite is a free version, it includes all of the features that its paid sibling does. The only difference is that you'll find some advertising in this version... which you can get rid of by buying the paid version.