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Revisit towns
Once you get the Teleport Psyenergy, you can use it on the world map to go to any town previously visited.
Alternate music
You only just need one party member to change the music. If Felix is in the party, no matter who else is with him it will stay with his battle music. You just need Jenna in the party to hear her battle music and only Isaac to hear his version. The game chooses which music comes first if you have all three music-changing characters in the battling party. Felix's is first, Isaac's is second and Jenna's theme is last. For example, if you want to hear Isaac's or Jenna's theme, make sure they are the only music changer in the battling party.
Once you meet up with Isaac's group, the battle music will change depending on who is battling. For example, if you have Isaac, Garet, Ivan, and Mia battling, it will play the music from the original Golden Sun. Also, if Jenna is there, but Felix is not, it will play the Jenna/sailing battle music.
Defeating Dullahan
Dullahan has over 10,000 HP and unlimited PP. The only way to defeat him is by summoning. He recovers 200 HP each turn and can absorb your HP. Bring out three Eclipses and three Catastrophes and that should finish him. If he still is not dead, power up the party member who has the Sol Blade with a few Impacts, then deliver the final blow. Be extremely careful of the Djinn Blast.
First, make Isaac and his party first and Felix and his party second. Then, put all of your Djinn on stand by. Next, have Ivan summon Catastrophe, Isaac summon Charon, Garet summon Ulysses, and Mia summon Ulysses. After they have all attacked, do any other summon until your remaining party members die. Do not try to heal them. When they are all dead, Felix's Party should come up. Make Sheba summon Catastrophe, Felix summon Charon, Jenna summon Ulysses, and Mia summon Ulysses. After that, Dullahan should die. If he does not, use any of the remaining summons to finish him off. Do not try to heal any defeated party members.
Have everyone at about level 50. Have your main party consist of Felix, Jenna, Sheba, and Piers; and the second party with Isaac, Garet, Ivan, and Mia. Before fighting, send everyone into battle with all Djinn on stand by. Then, have Felix summon Charon, Jena summon Ullyses, Sheba use Catastrophe, and Piers do the same as Jenna. Once all these are summoned, wait for this party to die and use powerful Psynergies. When your back up party arrives, repeat what was done before with the matching adepts. Dullahan should die. Note: You probably will not win if he uses Djinn Blast.
Have the following people in your in your party to start: Garet, Peirs, Sheba, and Ivan. Have these people in the second party, and put four Dijinn on standby for each person: Isaac, Felix, Jenna, and Mia. Put all Wind Dijinn on standby except Kite, who you should give to the fastest Wind adept. Put all of Garet's Dijinn on standby except for Flash. Then, put two of Peirs on standby. To start, use Flash, Diamond Berg, Kite, and Catastrophe. On the next turn, use Heat Wave, Shade, Catastrophe, Eclipse, and Catastrophe. Fight until the first party is downed, then summon with the second party.
Dullahan has about 16000 HP,200 PP, 676 ATK, 269 DEF, 241 speed, attacks three times per turn, puts all your Djinn in recovery mode, summon Charon, recovers 200 HP per turn and kills a party member in one hit. His weakness is Wind and resist against water. There are two attacks you should watch out for. They are Formina Sage and Charon. First, get your party members to about level 50. Before you go into battle, put all Djinn in stand by mode so that you can summon at the start of the battle. Let Isaac, Garret, Ivan, and Mia go first. Make them summon each of their own element (Judgment, Meteor, Boreas, and Thor). If his use one of the two attacks previously mentioned, try again. Do the same on the second turn. On the third turn, let them die but still use Psynergy to hurt him. when the first four die, the next four will replace them/ Do the same with the second set of characters. You should win after the fourth Thor you use, incuding Ivan's two Thor. You will get 15,600 experience and 6,775 coins. When you are done, walk to the tablet. You will get the Iris summon. Iris is the strongest summon in the game. It inflicts a lot of damage and heals all your party members and revives downed party members.
Defeating Star Magician
Use the following trick to defeat Star Magician in Treasure Isle in about thirty to forty five minutes. Make sure you have Isaac, Jenna, Felix and Sheba/Ivan in your party. When the fight begins, have Isaac attack the balls only. Take out the refresher balls first to prevent them from healing Star Magician; then the guard balls; followed by the anger balls; and finally the thunder balls. Do not let the Star Magician to gain more than three thunder balls. Do not have Jenna attack at all. Instead, have her heal the entire party on each turn. Felix should attack (no Psynergy) the Star Magician. Sheba/Ivan should only use Psynergies to raise the party's Impact and Resistance. Concentrate mainly on the balls and not on the Star Magician. If you get to the point where there are four to five balls on the screen, then only attack them. After about a half hour, you should be able to take the Star Magician out easily due to the fact that the refresher balls were taken out first. After defeating the Star Magician you should gain 20,000 experience points.
Star Magician has over 5,000 HP. Defeat the refresher balls and guardian balls so he cannot get healed or shielded. He is extremely weak to Earth. Use a lot of Venus Djinn and summon Judgement whenever possible. Defeating this Boss will take a long time. He will give about 30,000 to 35,000 experience points. It guards the Summon Haures (three Venus and two Mars Standby Djinn are needed).
The Star Magician is in the last room of Treasure Isle in the Northern part of the Great Eastern Sea. He is guarding the summon Azul, which requires three Earth Djinn and four Water Djinn to summon. An ideal level to fight him at is 35. Before the battle, put your Djinn on "Set" and save. This battle could last up to about 45 minutes, depending on your level and how fast you work. The Star Magician cannot call out another ball if there are four out already. You want him to have four thunder balls out; do not harm any thunder balls. From the beginning, you should build up your defenses with Sheba. Jenna should heal just about every turn. Ignore the Star Magician until there are four thunder balls out. Then, attack only the Star Magician. Ether is very useful. Later in the battle, if Jenna's Psynergy gets low unleash Ether to restore it. If Jenna cannot keep up with the damage, either have Sheba increase your resistance, unleash a Djinni that heals your whole party (such as Flower), or use a Mist potion. Felix and Piers should attack the Star Magician every turn with a weapon or with Psynergy like Odyssey and Diamond Berg (although the Star Magician is resistant to water Psynergy). The Star Magician has about 7500 HP. Once you defeat the Star Magician, the remaining thunder balls should not be a problem.
Have Isaac and Felix in your party. You must have both of the following Djinn: Petra and Ground. Set one to Felix and the other to Isaac. You can choose any other two characters as desired. On each turn, Unleash Petra and Set Ground, or vice-versa. Use them alternately on the Star Magician. This will prevent him from creating any new balls or doing anything else. Use your other two characters to attack and destroy the balls, then focus on the Star Magician.
Defeating Bosses
For easy Boss battles. have two people in your party (for example, Isaac and Felix) use Barrier Djinn. One turn, have one of them uase a Barrier Djinn and the other person set his Barrier Djinn. This way, you will always have a barrier. With the other two people, get one healer(for example, Mia or Jenna) and one fighter (for example, Garet, Isaac, Felix, or Pierre). Give the fighter the best weapon as the other two will be using Djinn and give your healer PP restoring clothes and other items.
To defeat Bosses easily later in the game, you will need a certain Summon, and Isaac and friends. First, put four of Earth and four of Water on your Fire character, or whatever works to get you a "Dragoon" ranking on both your Earth and Fire characters (as well as the highest ranking you can get with your current Djinn for your Wind and Water characters). If you do not have enough to get Dragoon, Samurai and Ninja are also powerful, just not as much. Summon the monster that says, "A Goddess Bearing The Water Of Life". While the effect heals and revives you, use your most powerful Summons (Meteor with a Fire character, Judgment Day with an Earth character, etc.). When the healing effect wears off, use Djinn that modify the stats of the opponent combined with Barrier Djinni until you have enough Djinn ready to summon the "Goddess Bearing The Water Of Life". Attack with Djinn and keep summoning the healing summon until the Boss is defeated.
Atropos' Rod
To obtain this rod, defeat the Fire Dragons in the Yampi Desert Cave. Note: You will need Teleport Psynergy.
Clotho's Distaff
Walk around the inside the Mars Lighthouse until you encounter an Aka Manah. If you defeat one, it may drop a Clotho's Distaff. If not, keep trying. This may require take some patience. Clotho's Distaff sells for 12,900 and boosts attack by +168. Although it has it has no unleash, it can restore 1,000 HP inside and outside of battle.
Darksword
The Darksword can be obtained by taking a Dark Matter to the blacksmith. It is rare to get from him, and is cursed.
If you went to Cross Bone Island and got the Clerics Ring in the original Golden Sun and transferred your data, when Isaac's group joins yours, give Felix the Clerics Ring, as it removes a curse effect. Then, obtain some Dark Matter and bring it to the blacksmith. Save the game before you give it to him. Keep reloading until he gives you the Darksword. It is the best weapon in the game, and it has an attack of 210. However, it is cursed which is why the Clerics Ring is required to use it.
Gaia Axe
One of the rarest forged items is Gaia Axe. It has an attack of 163 and unleashes Mother Earth, which sometimes puts an enemy to sleep.
Lachesis' Rule
The staff Lachesis' Rule can be obtained from the strong demons in the Anemos Inner Sanctum (Djinn Dungeon). Use Djinn of the element that they are weak against to increase the chances of them dropping it. This staff is a point weaker than the Tisiphone Edge, has a great unleash called Apocalypse which does a good amount of damage and may cause a death countdown on an enemy. This weapon is best used by Sheba and/or Mia.
Masamune
If you transfer your data from the Golden Sun, you probably will have the Force Orb to use The psynergy move, Force. You can use Force to knock down the log to the left of the blacksmith house in Yallam. Hop across the log then use Cyclone to reveal a secret underground entrance. Go into the cave and follow it all the way through. When you are outside, you will find a chest which contains the blade, Masamune. It unleashes Rising Dragon, that can do up to double the damage if two Dragon Spirits hit an enemy.
When you get the Masamune on the side of the Blacksmith's house in Yallam using Force, it unleashes an attack of one or two dragons. If you do not press any buttons during the unleashing, both dragons will appear, doing double the damage as opposed to only one dragon when you press [A] or any other button.
This trick requires transferred data from Golden Sun. The mystery of the powerful light blade that you can access with GameShark has been solved. If you have the Kunasagi and still have it in your inventory in Golden Sun, this mysterious weapon reveals its true power in Golden Sun: The Lost Age. After you join Isaac's party, look in his party's inventory. You may notice that the Kunasagi has turned into the powerful sword, Masamune. The same goes for the Sol Blade in Golden Sun; it will be upgraded to the most powerful sword in the sequel.
Orihalcon
Kill a Sky Dragon (found inside Anemos Sanctum) with a Wind Djinn to get an Orihalcon. It is a rare drop.
Rune Blade
Go to Magma Rock and defeat Lesser Demons. The Rune Blade rarely drops. It has 167 attack and unleashes Void Beam, which does 200 to 270 damage.
Sol Blade
The Sol Blade can be found at the Mars Lighthouse. It unleashes often and is the most powerful weapon in the game. Only Isaac or Felix can use this sword.
The best weapon is the Sol Blade, with an attack of 200 and is valued at 31,200. It is a long sword that can be equipped by Felix and Piers. It unleashes Megiddo and is found in a chest at the Mars Lighthouse.
Tisiphone Edge
To get the Tisiphone Edge you have to fell a cruel demon in the Sea Of Time Islet cave after the trading process with a Mars Djinn. It is a rare drop. You will get it in the hall with the shaking statue. Its unleash is called Vengeance, which is an archer that shoots arrows. The more arrows that hit, the better the damage. About 1,000 sometimes results in a a perfect unleash.
Revisit Vale from Golden Sun
Once you join Isaac's party, go to Loho with your flying ship. Your ship needs to be able to fly if you you want to reach Vale. Once you get near Loho, use your ship to fly to the southern part of Loho, nearly between the ocean and the mountains. Let your ship face directly south in between the crack near the mountains and the beach. Jump off the ship, south, and you can now freely explore the land where Vale is located. There is no need to run around here, as once you get to Vale all you do is run through it. None of the other cities from the first Golden Sun is here, although Lalivero is present but you cannot enter it.
Finding hidden items
When you are looking for hidden items inside pots, crates, barrels and so forth, set Reveal to [R] (go to the main menu, then select "Psynergy", then "Sheba", then press [R] and choose "Reveal"). To check for hidden items, press [R] and it should turn up as a tiny gold star.