A question for you guys SRing Diancie: Have you been looking out for alternative natures too?
There's a couple of natures, like Timid and Jolly, that might be worth looking into given the hints that Mega Diancie might go on the offense.
I'm going for bold, calm, naive and even quiet. Those are the ones I'm aiming for with two of them, my third will be farmed at a later date.