It depends on your system, if your using a emulator, such as VBA, or NO$GBA, you have either inserted the code for another game, or, you have inserted the code wrong.
i had the same problem and right now I'm tryin to figure it out :(
your game may have been released after the version of gameshark you have.
my thing that says game shark codes it doesnt work do i have to download it or something
you have to get a game shark for your game and insert the game pack inot the shark them select unlimited master balls and you will get them but it wont be unlimited anyway
it is banned
i think so.
It wont work in your game system
Not true, it runs on the ps3 but the disk that i own is scratched up so it displays nothing but i can hear the sound. No, It will not work, the system will "reset" itself when you take the game shark disk out and place the game you intend to play. It wont even load the game shark disk at all.
no
do you you mean the Nintendo thing does not pop up or on the ds it says no gba game inserted or something like that. If that happens you need to email them a complaint (that's what im doing) find the email address at www.gameshark.com
Often the game disc is scratched and damaged
No they wont work on a SNES.