Do you get to keep your GP/Items even after your tamagotchi dies? And also, if you give away one of the secret items as a present, can you get it back through the use of the secret code?
After your tama dies no, you don't get your items or points back. You lose it forever. And if you give a present that you got from the codes to a friend then the only way you can get it back for free is for your friend to give it back to you. If you put the code back in again you'll have to pay for it to get it again. Hope this helps!