When choosing a quest, take note of the icons types found next to it. This icon corresponds to the most common type of enemy you will encounter in that quest. Use this knowledge to bring the correct medals as well as keyblades. For example, the top medal slot for the starting keyblade Starlight shines blue, which indicates that magic medals placed in that slot will gain a small boost. The next keyblade, Treasure Trove, has a power slot on the bottom. Match the keyblade with the appropriate medals.