Lol 0.o
Well......um first make sure your typing in the right thing, and if it still doesn't work I don't know what to tell you. I googled it for you and thats pretty much all it told me, however it also said that some peoples games lack the password system for some reason, lets hope your game isn't one of them.
Also here is where you post your dbz passwords to play people, however since this topic is a question its fine here. But if you ever want to play other people on SC here is the link.
http://forums.supercheats.com/topic.php?topic=41196&page=6
Pokemon DS record since return to sc 29-3
fc 0301-9016-8239