Register two of the same game at Club Nintendo?

Is this possible? If not, I've got an extra PKMN MD Sky and PKMN Platinum code and I'd love to trade those codes for other codes of games that I probably haven't registered, thanks!

Yes, just add another person to your account (Mom Dad Dog) and then register it under them.

All the points are pooled so you're still able to use them all for what you want.