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After you defeat the Champion in XY, your friends don't know how to treat you- mainly because you've done nothing but destroy all of them in battle, and take everything for yourself. Your rival will literally never surpass you, and they'll all feel like tagalongs to your success for the rest of their lives.
Professor Sycamore probably won't take on any more pupils for a long while, possibly ever again because even though you, the PC, were a huge success, Lysandre was batshit crazy enough to put him off trying to teach anyone else.
I don't know. This is probably just speculation more than it is actual 'headcanon'.
