>>42439989It's not about her doing something, it's about her being a memorable character that contributed to the Ashnime's popularity and Pokemania as a whole. She was a tsundere before tsunderes were even a thing, her interactions with Ash are memorable(for the wrong reasons though) and her design is more than generic anime brown hair girl like Leaf, who wasn't even in the game unlike Misty. That being said, the best choice for the Gen 1 companion for Ash would have been Blanche.