How do you help the little boy in canalave?

go in to where the boy is in the house in cannalave then speak to the boy he will say about darkiria then the sailer comes in and talks to you then go out side click on the sailer he will say could you get a item for my son so he can wake up go to full moon iland then there is cressila who disaperaers and she leaves a poke ball contaning the item.go back to cannalave he will give it to his son and then you are doneeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee!