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What if, just what if this GF did this instead:
>There are version exclusive champions in X and Y
>In Pokemon X, the Champion is Diantha.
>When meeting Diantha after beating the Elite 4 for the first time, she'll start off her default speech and then ends her speech with how Lysandre attempted to defeat her but failed to do so.
>While in Pokemon Y, the Champion is Lysandre.
>When meeting Lysandre after beating the Elite 4, he'll start explaining how he survived the blast in Geosenge Town and how he defeated Diantha before hand. When ending his speech, he'll say that he'll get his revenge for his fallen team.
TL;DR: The champion for X is Diantha; The champion for Y is Lysandre.