My reading tells me that it is possible raise intelligence to a certain degree with training. With DS6 what I chose to do is simply to discuss Dweck's research and its implications, so he won't "psych" himself out when things get tough. It seems to have worked to a large extent, though he still backslides into perfectionism sometimes. I also discussed the J. Renzulli three ring model with him, emphasizing effort further. (From my phone)
ETA: I'm at my computer now. I just wanted to add that I actually brought up the nature vs. nurture intelligence debate with my son in the course of my discussion with him, and we agreed that for purposes of motivation, it really doesn't matter what's correct in light of Dweck's results. Bostonian, perhaps just explaining the experiment in detail and the results would be enough, as a cautionary tale, without having to claim something in which you don't believe.