The boy was shot in the arm in an apparent drive-by that was targeting someone else Sunday afternoon.
The vehicle is a white Scion xB with chrome rims. Detectives say the three suspects fled in the Scion after the shooting.
The shooting happened around 2:50 p.m. on the 1100 block of Cornelia Street.
Anyone with information is asked to call the Pomona Police Department at 909-620-2085.
Anonymous information can be provided to Crime Stoppers by calling (800) 222-TIPS (8477), using your smartphone by downloading the "P3 Tips" Mobile APP on Google play or the Apple Store or by using the Crime Stoppers website.