Yellow

Yellow, or Amarillo del Bosque Verde (イエロー・デ・トキワグローブ Yellow de Tokiwa Grove) is a main character in the manga series Pokémon Adventures. She first appeared in volume three, when she was saved by Red from a rampaging wild Dratini. When Red goes missing, Blue sends Yellow out to find him, and has her disguise herself as a boy. Most of the characters did not learn her real gender until the end of the GSC saga: Yellow's straw hat hides her ponytail as well as containing the Rainbow Wing and Silver Wing. Yellow's first Pokémon is a Rattata that Red helped her catch. Her starter Pokémon is Red's Pikachu which travels with her when she searches for Red. She later obtained her own Pikachu, Chuchu, which made a Pichu Egg with Red's Pikachu at the Johto Pokémon Day Care. Yellow is quite naive, and acts very much like a little child. She hates it when Pokémon are injured, hers or her opponent's, and has developed a style of battle in which neither her nor her opponent's Pokémon are hurt unless it is absolutely necessary. Yellow's special skill, as described by Professor Oak, is Pokémon healing and is called the "Healer" (癒やす者). She received psychic abilities from Viridian Forest, which include the ability to read the emotions of Pokémon and heal their wounds. Yellow is physically small compared to the rest of the characters. (Source: Bulbapedia)