I don't know about it being fake. That sounds like what happened to my yellow after i accidentally dropped it in the toilet when i was 5. Does it look like you're throwing a box at another box when you throw pokeballs at pokemon?
The Gameboy Advance (with the exception of the Gameboy Micro) is, indeed, fully backwards compatible with Gameboy and Gameboy Color games.
Missingno said:Since cartridges use their own small internal memory chip, once the batteries die, it's a no-go. It might be that it accesses temporary memory for the image files.
Just a thought.