Has an AFL game ever ended 146-55?
Exactly once. On May 27, 2018, Melbourne beat Adelaide 146-55, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 146-55 in league history.
That makes 146-55 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 147-55 has happened 1 times and 146-56 has happened never.