Serena (Pokémon)

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Serena  is the Pokémon Trainer in the games, Pokémon X and Y. According to the anime, she

appears to have known Ash  before and have been childhood friends with him ever since. Serena met Ash from the time they attended Oak 's Pokémon summer camp in Pallet Town. During that time, she got lost in the middle of a forest while trying to find her group. Just then, a wild Poliwag  jumped out of the bushes and scared her, causing her to fall on the ground and hurt her knee. Scared and upset, she called out for her mother for help. But moments later, someone came out of the bushes calling for Poliwag. It was Ash. He too was wondering through the forest only to be looking for Poliwag. While he was looking for it, he stumbled upon the young and frightened girl. Seeing how incredibly hurt she is, he bandages her knee up with a clean, blue handkerchief. Then he lended her his hand, warning her to not give up til it's over, and helped her stand up on her feet. After that, he escorted her back to the campsite. Ever since their first encounter, Serena developed romantic feelings for him and she kept that handkerchief and as a reminder of the day she first met Ash.