>>55915884i don't think an NPC who probably heard about this stuff through word of mouth is going to realistically cater to gamefreaks autistic differentiations between legendary pokemon and mythical pokemon compared to, say, text on the mystery gift screen. plus, if they said it was a mythical pokemon, wouldn't it just be a dead giveaway to which pokemon did it instead of being purposefully vague?
otherwise, though, it probably is true that the sundials role in Z was likely going to be for the XYZ legendaries, and for giving background to the mega stones. if there was any correlation with diancie at all, it likely wouldve been implied through one line of text at most.