Dawn, Pokémon Sun and Moon Abridged Wiki

Dawn was a former travelling companion of Ash who accompanied him through the Sinnoh region. She was voiced by LiliumConcolor. Dawn appeared in a flashback in "Time Flies". After comparing her to Dawn, Iris demanded to know who she was, prompting Ash to tell another story. Dawn is seen arguing with Ash over his neglectful behavior. It is revealed that Dawn was left to "raise their Piplup alone". This caused Ash to state that he should have stayed with May. Dawn then demanded to know who May was.

On another note which one of these girls could you beat in a fight? (either a fist fight or a Pokemon battle) : r/pokemonanime

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I don't know what too think about the fact Dawn is one off returning as many times as Misty… : r/pokemonanime

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Dawn, Wiki