>>51804831Few reasons but most precise reason is the same reason Kalos didn't talked so much compared to Sinnoh: XY didn't get it's third version Pokémon Z unlike DP which got Platinum.
First and foremost, Cynthia in Diamond & Pearl is shit. And Platinum fixed her with more player immersion with her, making her very memorable there
>Zero meaningful interaction with player prior to champion battle in DP. You met her in a very nothingburger matters, and you forgot who is she the moment you see her after beating the elite four.>Not in case of Platinum which she has more encounters with you.>She gave you a rare eggmon Togepi. One memorable moment to note>Distortion world, biggest hallmark on her charm.Diantha in XY is nothing more than celebrity that you won't recognize she is the champion, do nothing to help you for the entire game.
Another reasons:
>Shit Ace pokémon. Gardevoir perfectly match her, but kinda unoriginal for Hoennmon as her ace. Should have Kalosmon like goodra.>Not to mention how being overleveled in Kalos makes her fight trivial, unlike Cynthia (with her Garchomp) that leaves a menacing first impression.XY is such a lots of missed opportunity and there is no third version followed to fix that. If she could get the same improvements just like Cynthia did in Platinum, she could have bigger chances to surpass her on popularity. At least how Steven appears in ORAS is a template on how Diantha should appear.