Has an AFL game ever ended 138-45?
Exactly once. On May 19, 2019, GWS beat Carlton 138-45, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 138-45 in league history.
That makes 138-45 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 139-45 has happened never and 138-46 has happened 2 times.