Has there ever been a 12–5 in all competitions?

Never.

It would be a scorigami. Based on the average number of goals in all competitions, the chance of a game ending 12–5 is about 1 in 913,274,168.

Nearby scores

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