Where the heck is the shop on tamagotchi verion 5 ?

I don't think there are any secret codes for v5, at least in the way the other versions have been. If you need to know where the shop is, go to the TV icon (middle on the bottom) and select "TV Shopping". Then you can select an item with the A button and confirm with the B button. I'm sure eventually someone will find some cheats, but for right now, there aren't any. Hope this helps!

Here is a growth chart :

http://www.tamenagerie.com/famitama.html

and to enter secret codes for free items go to the Heart thing that you go to, to connect with people and go to special and then enter the numbers.

to buy stuff, go to the tv and go to TV SHOPPINg

sorry,i don't know what do you mean by the secrect code.

well........ first you need to play games and then buy stuff from
it and you could also transfer toys from the computer to your tomagatchi