The girl said he forced her into the toilet block where he allegedly sexually assaulted her.
Mr McGregor said while not physically injured, the girl was left ``emotionally shocked''.
It is understood she has since undergone counselling.
The attack happened about 1am. A member of the public who had been in the area earlier reported seeing a young man walking around the shopping area. He was described as acting ``agitated''.
The person who saw him said he was wearing a blue checked shirt and jeans.
Mr McGregor said the CCTV footage came from a camera in the area of the shopping centre, and was ``very clear''.
The youth will be appearing in the Napier Youth Court tomorrow.