However, the boy's lawyer, Harry Edward, ask Judge Jocelyn Munro to instead impose the "robust plan" agreed at a family group conference by all except police. Mr Edward said the plan was "no soft option" .
Judge Munro said she had seen "much too much" of this type of offending recently.
"There's a theme to them. People getting together, usually after drinking, with balaclavas and weapons, going into a liquor store or shop and demanding alcohol or money. You are one of them."
Judge Munro said the starting point for aggravated robbery in the District Court would be three years' jail. However as it was the boy's first time in court and because she was satisfied with the sentencing plan, she would not transfer him.
The 14-year-old co-offender will be sentenced on September 18.