Port Phillip Crime Investigation Unit detectives charged a 15-year-old boy following an alleged armed robbery that left a man with serious injuries in St Kilda on 12 January.
It is alleged a male and female approached a man who was walking along Barkly Street and made demands for his car keys about 9.15pm.
The male offender, allegedly armed with a machete then assaulted the victim and the offenders ran from the scene empty-handed.
The victim, a 39-year-old St Albans man was taken to hospital where he remains with non-life-threatening injuries.
Police arrested a boy at Southern Cross Railway Station about 12.30pm yesterday and charged him with armed robbery, intentionally cause serious injury, assault with weapon and possess controlled weapon.
He was remanded to appear at a children's court.
