Has an AFL game ever ended 84-52?
Exactly once. On June 7, 1913, Geelong beat Melbourne 84-52, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 84-52 in league history.
That makes 84-52 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 85-52 has happened 2 times and 84-53 has happened 3 times.