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It's clearly obvious that beyond the OS, every pokemon series starts better than its previous series ended (new series hype) before a general downwards trend to the finale. Then there's an overall downwards trend as the series loses popularity (which is an obvious result of pokemon getting less popular and people losing interest in an anime that fundamentally never changes its formula). I say this as an XY fan, XY did not do nearly enough to separate itself from the previous series, it didn't commit hard enough to anything that might've broken the trend. The best you can say is that it had the highest spike from its previous series. SM meanwhile bucks the trend in a *minor* way, staying statistically flat throughout its run time, a product most likely of its change to the formula, maybe artstyle.
The idea that SM and XY fans have any right to argue with each other when they're both just minor variations of the same trend that's been going on for decades is laughable. Just suck it up, we were each a minor variation on a mediocre children's cartoon. Why don't you advocate for the current series to do something you like instead.