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What if they have an expansion pack where its revealed to us players that Diantha was actually Cynthia s' younger sister (back in Diamond and Pearl, Cynthia s' grandma was Celestic Town s' Elder, and she apparently lived (not including the Elder s' husband) with a Lass who said her sister was an archeologist. Her name is not given, so she could easily be Diantha. Also, Diamond and Pearl are set in 2004, where Dawn is ten. If we consider Dawn and Lass\Diantha to be the same age, they would both be 18 in 2012, AKA when X and Y are set.) and we will have a scene with the two. It's possible Cynthia lives in Kalos with Diantha, or the 7th gen region, we might get a snippet of their home life, or even of their parents (the generation inbetween the Celestic Elders and the two champion-girls who are not Iris.) Also, Cynthia would be 35 by then. Maybe she's retired from being the Champion, or had a life? Maybe she's even gotten pregnant and now has a kid? (And maybe maybe said kid grows up to become the main character of Gen VII. But since protagonists always have absent dads beside Norman, better keep the father ambiguous.)
And well, in this expansion pack, somehow the group (Cinthya, Diantha, Cynthia s' possible kid, the protagonist, and possibly some other NPC including but not limited to Calum\Serena, Tierno, Trevor, Shauna, Prof Sycamore, Looker, Emma, Dawn, Barry, and maybe others.) go to the sundial, something related to Carbink appears, and Diantha becomes (a?) Diancie. And either Cynthia, Dawn, Calum\Serena, Kevin Bacon, or another (possibly customizable?) NPC, becomes the Kalos Champion.