On the legend of zealda phantom hourglass when will ezo give you a letter?

In "The Legend of Zelda: Phantom Hourglass," Ezo will give you a letter after you complete the side quest involving him and the Ghost Ship. Specifically, once you return to the main island after progressing through the game, Ezo will appear on the dock and provide you with a letter that contains information about your journey. This moment typically occurs when you have made significant progress in the game's story.