SnoopingGil
professional lurker
Correct me if I'm wrong, but I don't think a loss of 4 points in a stat like Special Defense is really going to matter in the long run, since it's like 2% of the full stat. On the other hand, Speed is a stat where even a couple of points can make a huge difference, and you are running a Speed-boosting nature, so I think it would make more sense to go for the perfect Speed IV.