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This is such a weird season. I mean we know the other shows exist within the context of this season. We've seen Ash's previous journey stuff in the first episode and then he references meeting Ho-Oh but now he's acting like he's never met a Dragonite when it was one of his companions aces? Bizarre.
I don't ask for a lot from the Pokemon anime, usually even consistency can be thrown out the window with the "Just think of it as an entirely new anime every season". But when they're actually referencing past events then just forgetting others it's just.. weird. I'm 100% sure Ash's Greninja won't be returning at this rate.