Has an AFL game ever ended 126-37?
Exactly once. On June 29, 1912, Sydney beat Richmond 126-37, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 126-37 in league history.
That makes 126-37 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 127-37 has happened never and 126-38 has happened never.