Well from Gen 6 onward, the Destiny Knot states that the offspring will have 5 of the combined 12 IV's from both their parents to be passed down. So to answer your question, ANY combination between both parents are possible
0 and 5 IV's
1 and 4 IV's
2 and 3 IV's
3 and 2 IV's
4 and 1 IV's
5 and 0 IV's
where the first number is the 1st parent and the second number is the 2nd parent
Hope I helped! :)
