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This episode>Iris Episode>Alola Friends episode>First part of Dawn arc
I'm not going to lie I'm kinda frustrated how Ash and whichever companion gets brought back don't really interact with each other to much. I can already see a Serena return with her not even meeting up with Ash until the end of the episode/arc since she'll likely be paired off with Koharu for Contests/Tripokalon stuff. Same with May if she returns even though she's the person who has gone the longest without meeting Ash currently.
That being said todays episode wasn't that bad, whoever the director was did a good job storyboarding it.