I posted these same instructions awhile back, but have since learned of a way to SAVE ALL YOUR OLD POKEMON! All that you need to do is use the transfer pack on the N64 (the thing that hooks up to the bottom of the controller for your gameboy cartridge). I used Pokemon Stadium 2, which has a feature where you can store all your PC boxes on the Pokemon Stadium cartridge to load back on your gameboy when you've replaced your game's battery. Go to Professor Oak's lab in Stadium, and use the machine on the far-right side. Thanks for reading.