Easy money
Talk to the priest that saves the game and ask to give a donation. If you have less than 100 Z he will give you 10 Z until you reach 100 Z. After this happens, deposit the coins, return and repeat as needed. Note: If you try to have the priest give you more than 100 coins he will take them as a donation.
Go to the grass areas that move around on the map and make sure that you have Bow. Set Bow as the leader and press [A] to shoot a rock or stone. Aim for the animals. If you hit then enough of them, they will turn into Roast which sells for 200 Z. Note: Watch out for the weak monsters.
Life Bracelet:
Immediately after you fight Barubary with Ryu alone, he gives you a hint to find the Life Bracelet. Go directly right with Katt and smash the rock ahead. Continue right and reach across the gap with Sten, then open the treasure box to find the Life Bracelet.
Life Armor:
The Life Armor can be found in the fishing spot northwest of Gate, directly next to the cave. This is the strongest armor in the game for the Hero.
Unlimited money:
Note: This trick requires two Game Boy Advances, two games and a link cable. Select the best file and put the best item you can spare in the bank (for example, the Shadow Dagger or lots of Herbs). Copy the file and link the Game Boy Advances. Trade the best item from the copy file, but not from the original. Then, erase the copy of the original and repeat entire process. When you have as many items as desired, trade them back and sell them.
StarBringer Sword:
The StarBringer Sword (StarrSD) can be found by standing on a blue "chance" square in the Thieves' Tomb and fighting repeatedly.
Fun with Bleu
After you get Bleu as a party member, go to township and make sure she is not in your active party. Go to her room, which on the last floor and final room. She is sleeping. When you talk to her, she mumbles about Ryu and goes back to sleep.
Experience for final battle
Just before the final Boss, where the Dragon Statue and Cleansing Water are located, fight any monster and use Gold Dragon. After that, use the Cleansing Water to restore your AP and HP and repeat until reaching the desired level. This can also be use near any Cleansing Water pools that are occupied by monsters.
Unlimited money
Note: This trick requires two Game Boy Advances, two games and a link cable. Select the best file and put the best item you can spare in the bank (for example, the Shadow Dagger or lots of Herbs). Copy the file and link the Game Boy Advances. Trade the best item from the copy file, but not from the original. Then, erase the copy of the original and repeat entire process. When you have as many items as desired, trade them back and sell them.