B767-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
General Declared Emergency
Aircraft
Right engine lagged behind left engine on descent and descending through approximately 8;000 feet; right GEN OFF EICAS message appeared followed by right engine low oil pressure.  The right engine then flamed out.  We declared an emergency with Approach Control; followed by an uneventful landing.  The flight attendants and passengers were briefed for a precautionary landing.
B767-200 Captain reported right engine flamed out on approach. An emergency was declared and the flight landed without incident.