Yea... It is definitely a counterfeit. I only bought it online because I figured $20 was a good price for an old game like this, and in Syracuse we only have like 5 EBGames and they never have it.
I'm going to report him as a bootlegger to Amazon as soon as they let me. I may try to call and get things fixed faster, but I see no reason to try and deal with the seller.
EDIT: also, the cartridge is a ligitamate cartridge. I think they ripped the internals out of another game, and put the new label on the front. I'm so sad now. I can still play the game, but I Wouldn't be able to turn the DS off for a month, as i figure thats how long it would take me to beat it.