Has there ever been a 12–8 in the Liga MX?

Never.

It would be a scorigami. Based on the average number of goals in the Liga MX, the chance of a game ending 12–8 is about 1 in 158,903,347,133.

Nearby scores

1. 13–7 Never
2. 13–8 Never
3. 13–9 Never
4. 12–7 Never
5. 12–8 Never
6. 12–9 Never
7. 11–7 Never
8. 11–8 Never
9. 11–9 Never