errr, I think that things either a real big fake.. or a real big illigal thing... emulating all those games can't be legal.. emulating is never legal unless you own the original game and use the roms as a backup, lol.
and no handheld will ever beat nintendo:
why make games for other handhelds if you can make games for the GBA? that's like writing programs for a totally unknown OS if you can make em for microsoft or something.
it's all about the monopoly positions in the market...