1.beat digla at the top of temperal tower
2.after that there is a cut sence
3.once u get ur hero back wiggleytuff and everyone else talks to u about how to graduate by getting back the treasure
4.Go to treasure town and talk to Ursrang and teddursa
5.go to the dungeon that wigglytuff told u to go to for the treasure
6.beat the boss
7.take the treasure
8.go back to the guild