The Gameboy, Gameboy Color and the Gameboy Advance ROM Archive
Things that you will need:
Gameboy/Gameboy Color/ Gameboy Advance Emulator (Try Visual Boy Advance, BizHawk will work aswell though) Microsoft .NET Framework 4.0 At least 3GB on your hard drive (The C: Drive) or on an external drive (USB, Floppy?, CD whatever)