It is on the bottom of the unit to the left of the serial number
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The wii number is the number you put into the ds so that your wii message board will receive updates when you trade over wifi.
Go to Wii Menu and click on Parental Controls. Then click on "PIN NUMBER" then puch in this number 1115. Its a secret code for any Wii.
PIN, or Personal Identification Number, is a four digit code used (on wii) for parental controls. I, personally, do not have a PIN on my wii.
Look at the bottom of your wii console call the number you see and then ask for one
No