Items you want:
(Ctrl + click to select more than one, up to 10 maximum):
NOTES:
Some meals (FRIED CHICKEN, WAFFLE, CHOCOLATE BAR) and snacks (LOLLIPOP, CANDY, CREPES) are listed without their price. You will get these for free when you input their password, but you won't be able to keep them because your tama will eat them right away.
If you want to keep them for later, you can write their passwords down and wait, or, if you want to be mean, feed your tama lots of snacks, until it has a toothache. Then, input the passwords before tending to the toothache. It will receive the food items but refuse to eat them, and they will be stored in your food lists.
There are a few items (such as the travel and donation souvenirs) that have certain prerequisites like having donated points to the King, having bought and used travel tickets, or having your tama at least in its 2nd/3rd generation. If you try to get those items with this hack and you haven't met the preconditions, I'm pretty sure you'll get an error.
Do not trash your food. If you delete too many food items (from the Present menu), you'll very likely run into the infamous "ball glitch", which can't be fixed without doing a full reset, losing everything. I recommend not deleting any food item at all, and eating it or giving it away as a present instead.
Missing from this list are the following items, which you can get through other means:
Obtained from the Tamagotchi Corner Shop 2 game for the Nintendo DS. More info here.
WHOLE CAKE:
I believe this appears for sale at the shop in your tama by your birthday.
YOGURT:
Not sure, I've been told it's available by your birthday as well.
RING:
Looks like the King might give you either one of these or a BOUQUET as a gift when you receive a fortune letter with 3 hearts.
LAMP:
Randomly appears for sale at the shop in your tama. Normally, it can be used several times, after that, it disappears from your item list. Each time it can grant you items, points, or strike your tama with lightning causing it to lose all its happy hearts. It's a matter of luck.
CD 2 / RC UFO:
These appear randomly for sale at the shop in your tama.