Pokémon: Did Dawn Need to Replace May?

In theory, May could have stayed with Ash when he was traveling to the Sinnoh region, but she was ultimately replaced by Dawn. Here

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May (anime) - Bulbapedia, the community-driven Pokémon encyclopedia

Pokemon: 5 Things May Accomplished After Leaving Ash

Chingling · Majestic Dawn (MD) #58 ‹ PkmnCards

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Pokémon: 25 Things That Don't Make Sense About May

May's not having this anymore by MayandKirby on DeviantArt

Pokémon Anime Series: The Pokémon Company's upcoming Pokémon anime series: Ash and Pikachu will not be main characters - The Economic Times

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Pokémon: Did Dawn Need to Replace May?

Why did the original anime series 'Pokemon' replace the characters of Brock and Misty with Dawn and May, respectively? Did you prefer one over the other, or both equally? Why? - Quora

Dawn and May Prepare to Dive- Alt Color Commission by The-Sakura-Samurai on DeviantArt

Commission: Dawn, May and Leaf the Pokemon by P1nkApple on DeviantArt