I use gamestoop alot and i tried all you can use is the powercard and gift card.
No, you can not.
you can get the dsi cheat codes at gamestop
It depends where the code came from. There are many moped codes that are availabe which you can reuse. However, codes which came from cards/stickers can not be used twice.
Yes There Are Animal Jam Codes For diamonds I Don't Know The Codes But There At GameStop
Sorry, but No.
action replay at gametrader and gamestop
I have looked online and it seems they do not. Sorry.
you can buy a action replay for your ds at gamestop then search for codes to put on it
reedeem codes at store like gamestop and find a card
Unused PSN codes are the codes you get on pre-paid PSN cards. You can purchase them from game stores such as GAME or Gamestop.
The codes come on paid-for PSN cards, available from places like GAME or GameStop.
You may only use gameshark for Pokemon firered codes! Buy the gameshark from gamestop. There are gameshark codes on youtube and supercheats.