Golden Sun The Lost Age Strategy Guide

From the Official Nintendo Page:
  

Return  to the world of Weyard, and see the other side of the story, in the  sequel to the hit Game Boy Advance RPG. Golden Sun: The Lost Age follows  Felix and his crew's mission to restore Alchemy to the world; a  potential catastrophe that the original game's characters were trying to  prevent.

As a new band of adventurers, unleash new Summon spells  and employ powerful Djinn elemental spirits. Plus - if you completed  Golden Sun you can transfer data to the sequel via password to unlock  items, stats and more! - Nintendo.com