If you wanted to make a GOOD Fake Pokemon game, your gonna need some skills. If you go to gamemaker.nl you can dln there game maker. But if you want it to be good, your gonna need to read a lot of tuts. Also, for cover art, Photoshop is your friend : D
For the sticker on the GBC cartrage, you can usualy buy sticky printer paper for like stickers at like Office Max or office depot. I remember watching on G4's Attack of the Show where you could import game into a blank GBA Cartrage. So mb you could do something like that on a GBC cartrage...just google it. So thats some advice for you guys and gal's