Has an AFL game ever ended 129-15?
Exactly once. On July 29, 1911, Carlton beat St Kilda 129-15, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 129-15 in league history.
That makes 129-15 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 130-15 has happened never and 129-16 has happened never.