When you get the Chief Fisherman's' Daughter, go to the beach where she goes to find the Aquamarine. When you fight the little Jewel Leapers. they give you the stones that are needed to make Runes. Get a large number of them and some gold, then go to the Rune-Makers shop. Refine the Gems into Runes, which cost 230 gold. When they are refined, the Rune Shop will buy them back for 400 to 500 gold. Repeat this trick as much as desired to obtain an unlimited amount of gold.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1645EBB30C107CD7 F89D21B7
Infinite Gold 3C293C37 85F19EFF
Infinite Medicine 1C294077 F8FCFEF6
Infinite HP 3C297577 A78F270F
Max HP 3C297757 A78F270F
Infinite MP 3C29757B FBE7FBD7
Max MP 3C29775B FBE7FBD7
Quick Level Up 2C297573 F8FCFFFF
Save Anywhere 2C1D721F F8FCFEF1
Extra Stuff 1 5C294077 F888FEF11DF82FD0 F8FCFEFE
Extra Stuff 2 5C2940B3 F889FEF11DF82FD0 F8B2CB061CF72ED0 F8FCFEFE