If you tag the matches as grand finals (by setting the grand final checkbox on the match fixture screen) then you can filter the Match Results report by applying the "Grand Finals only" filter plus your division filter. This will show you a list of grand final matches and who won them for any given division.
If you tag the matches as grand finals (by setting the grand final checkbox on the match fixture screen) then you can filter the Match Results report by applying the "Grand Finals only" filter plus your division filter. This will show you a list of grand final matches and who won them for any given division.