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So I'm gonna go full autism for a second here.
They seemed to have dropped that thing where the heroes inexplicably stick to just one Pokemon when fighting against criminals in XY, but that just raises even more questions, like why doesn't Ash just send out Fletchinder/Hawlucha to help out with the fight? At least in the past you could kinda explain away Ash just using one Pokemon because he was trying to "fight fair" or whatever, but in this episode they're going 3v1 against Barbaracle so that's obviously not a concern.