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I honestly cannot understand how anyone might legitimately, actually, genuinely think any series beyond XY is the peak of the anime. XY's animation, editing and music alone would be enough to give it the title, but no, it had to also have things like: the best main cast, which felt most human in how their dreams and insecurities were portrayed, who were actually allowed to EMOTE; the best evil team plan, with an actual world-ending plot that FELT apocalyptic and urgent and epic; the best implementation of Team Rocket until Sun and Moon came along, making them sympathetic, funny, but also reasonably competent depending on what the plot needed. It even had the best fillers this show has ever had, for fuck's sake.
XY is an absolute achievement of the anime and it will never be replicated again.