I found a gnome code on
GameFAQs:
Quote:
Enter during gameplay:
L1,L1,R1,X,X,Up - Gnome Code
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I'm not sure if that means it brings up a gnome display to enter codes, or if there will be a gnome object you can then buy that allows you to enter the other cheats. Try looking in the decorative section, if Pets has that.