If you’ve applied for a job and the employer asks the police whether you’ve ever had diversion, police policy is not to tell them, even if you’ve authorised the police to tell them. The police assume that in this situation you may only have given them approval to say so because you were under pressure from the employer.
If you have diversion, then the charges against you are dismissed and you don’t get a criminal record. So, if you’ve only had diversion and you’re asked if you have a criminal record. You can truthfully answer no.