To get all the dinurians you have to go to the multiplayer option and then choose wi-fi connection. There you will see the bonus data option select it and you will get a dragon message (*note. you will only get the dragon message if you already passed the game) When you get the dragon message you go to petrified woods and there you will fight Duna. After you beat her she sends you to hot spring heights to fight Raptin. When you beat him he will send you to fight Dynal in the pyramid this is the last dinurian and when you beat him you get the dinurians.