She is next to the Pokemon Center and delivered the 25 Bag of Polem's.
Scarlett: My butterfree cant fly anymore, nurse joy tell me to get some items but i have no time, can you do it for me? bring me 25 bag of polems.
Scarlett: I hope you can bring me back these items, i will give you a reward. Good luck.
Scarlett: You are back!, did you find the items?