You can't do any Mt. Gagazet missions and do every Moonflow mission. Then you go to Tobli's house in Chapter Five. There are several chests in there, one which is determined on what missions you did. You should get the Key to Success if you didn't help out the Ronsos one bet (this means you can't get episode complete in Mt. Gagazet which also means you can't get Mascot ><).