Golden Sun: The Lost Age Game Boy Adv Glitches

Avoid water monsters and waste almost no PP

Only works after you get the flying wings and the hover jade. Go in the boat and instead of pressing b to fly, go into your psyenergy menu and select hover. The boat will rise and then fall but the bar will still be there and it won't go down (you won't lose PP). During that time the game will think you are flying, so no monsters will attack you and you will hear the flying noise and music (but you aren't flying). The glitch stays until you press B. In which the flying music will get louder and you will actually fly.

Trial Road Duplication Trick

The glitch at the Trial Road Dungeon makes copies of items in the artifact inventories of the shops. From the time that Moapa opens the dungeon and until Felix beats Moapa every item that Felix and friends drop will be returned to Felix’ inventory when he leaves Trial Road. Entering dropped items in the artifact inventory of the shops is already part of the game design. Only the Laughing Fungus, Large Bread, Bone, Smoke Bombs, Sleep Bombs, Bramble Seeds, Oil Drops, Crystal Powder, and Weasel Claws will not be copied to the shop inventory.

When you enter trial road as soon as you control Felix drop an item you want to duplicate and then leave Trial Road. Go to an item shop and buy the duplicates of the item you dropped.

This can be used to duplicate Hyper Boots, the Swift Sword, Tear Stone, Lucky Medals, and Waters of Life.

Visit land from Golden Sun

It is indeed possible to get to the land from the first Golden Sun! First, go to the small beach southwest of the village Loho. Get on your boat, and face in between the small beach, and the tiny piece of land below it. Hit the A button to get off your ship and you should end up on the other side of the mountains! All of the towns are gone, except for Vale, but you can't enter it. All of the caves are gone, so you can't explore the entire world. The only other visible places are Venus Lighthouse and Babi Lighthouse. You won't be able to reach either of them, though.