Near the beginning of the game talk to the 2 ninjas near the messenger table by the "Amagurina" restaurant and they will give you a request to find all 30 of Tonton's scattered pearls. The pearls will appear on the ground all around the world map; they are indicated with the same symbol that appears on the ground when birds leave items before they fly away. You can only pick up these pearls when you're in control of Naruto. In every area (including Mount Myoboku and the Hidden Rain Village) that you enter be ABSOLUTELY sure that you have walked every inch of it, looking behind all the objects like trees and rocks and at the corners of the areas for the pearls. So long as you do that you should find all 30 of them.