I've already bred a 31/0/31/31/31/31 type with Own Tempo* and a Modest nature. Not only that, but I've wonder-traded away numerous 3, 4 and 5 IV rejects.
Not only do I have it perfectly, but I'm SPREADING it.
*Deliberately. Yeah, Chlorophyll's amazing, but I've got a decent anti-weather suite and am not running it myself.