That is true, but my answer is still correct. I should have been more clear. The EV training items are best used on the stats that only one parent can contribute because then other shared perfect stats have a greater inherit rate. In my example, since each parent had different perfect stats, the use of EV training items can be shared or not shared with the same probability of getting a perfect Bidoof. If you had a different IV spread with overlapping perfect IVs, then you may choose to use only one EV training item.