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Why does Ash need a rival? He doesn't need any extra motivation, he's already training his ass off because everyone has goddamn megas and shit. They're already forced to rehash the same basic structure of pokemon games, why force them to rehash the same plot points like a dickass rival for people to hate?
There is no shortage of good, intense battles in XY. You don't need "obligatory anime rival" for the battles to be enjoyable despite the fact that he's getting one in pic related.