Has an Olympic Basketball (Men) game ever ended 125-109?
Exactly once. On September 17, 1988, Brazil beat Canada 125-109, and no Olympic Basketball (Men) game before or since has ended that way. When it happened it was a scorigami, the first 125-109 in league history.
That makes 125-109 the 126th most common final score out of 698 that have ever occurred in Olympic Basketball (Men). One point away, 126-109 has happened never and 125-110 has happened never.