
My personal favorite Gameboy game (Advance only). And other people agree, apparently - it ranked at 94 on IGN's Greatest Games of all Time.
Golden Sun is a pretty typical RPG game, but really well done. By far the most important element in Golden Sun to differentiate it from other RPGs is the collecting and manipulation of magical creatures called Djinn. Djinn can be found scattered in hiding throughout the game, for each of the four elements and likewise for allocation to each character. The Djinn form the basis of the game’s statistic enhancement, as well as the system that dictates the character’s Psynergy (magic) capabilities.
Golden Sun 2: The Lost Age was also an excellent game. I really hope they bring out a third one