well, some pokemon codes don't work, if your getting codes from different sites then you will get confused. People post pokemon codes all around the world, some of them are wrong codes and some of them are right. Sometimes the master code is wrong, the only place with the correct codes is the official action reply and gameshark site. If the code still doesn't work you have to read the instructions book and know how to work the AR. To me, if the codes don't work it can also be the AR.