Long, long ago, after multiple tries, a young girl finally beat Blaine and went to challenge Blue. She tried to beat all the trainers without healing in between, and eventually lost. Because she lost a big chunk of her hard-earned money, she reset the game and realized she has not saved once after beating Blaine, and had to beat him again while drowned in her own tears. That foolish young girl is yours truly.
So the moral of the story: Save often.