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Just watched the new episode. Delia's great, we need more Delia. I thought it would have been amazing if her lullaby said something about being a pokemon master, then someone hears it and asks what a pokemon master even is and she tells them its just something she made up in response to Ash loving everything about pokemon.
I wonder if Koharu gunna wind up being a pokemon therapist/psychologist that tries to solve issues between trainers and their pokes. She'll catch that flower ring fairy type when they go to Alola for aromatherapy.