After evolving from Chikorita, Bayleef kept it's longing feelings for Ash which did end up getting it in trouble on several occasions. However after getting used to its size, it managed to become a vital part of Ash's team and helped win many Gym & League battles. Ash left it at Oak's when he decided to make a fresh start when he left for Hoenn. Chikorita → Bayleef ♀