Golden Sun - The Lost Age - Platform: Gameboy Advance

Rename characters:
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When prompted to enter a new name for Felix, press Select(3). 
Enter a new name for Felix, and you can now enter a new name 
for Jenna, Sheba, and Picard. Press Up, Down, Up, Down, Left, 
Right, Left, Right, Up, Right, Down, Left, Up, Select to enter 
new names for Garet, Ivan, and Mia if playing a non-linked game. 
A sound will confirm correct code entry.

Revisit last Sanctum:
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Hold L + R + Start while loading a saved game.

Auto-scrolling dialogue:
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Holding A + B while talking to people will auto-scroll the 
dialogue. For example, do this at the start of the game while 
talking to Alex.

Music test:
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Select battle mode then hold R when speaking to the woman on 
the left side of the screen. Press Left or Right to choose a 
song number and press A to listen to your selection. Press B 
to return to the selection screen. Note: Songs must be unlocked 
during game play.

Data link:
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At the black logo screen, hold L + R + Left and press B. A new 
option will appear. Select it to get "Password" or "Link". 
This lets you send cleared Golden Sun data to the next installment. 
Make sure you have completed Golden Sun and have a "clear data" 
on your save.

How to Defeat Dullahan:
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Submitted by: riorenzoneostar

You have to summon all the tablets you have earn like:
Charon
Catastrophe
3 Daedalus
Thor
Boreas
etc. just all summons except for iris.
once u survived all of thos and defeated dullahan, you will get the ultimate summon of 
all times, iris.

How to change battle music:
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Felix, Jenna, Sheba, Piers: Golden sun 2 theme
Isaac, Garet, Ivan, Mia: Golden sun theme
Jenna, Ivan, Mia, Sheba: Jenna's theme

How to change names of characters:
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3 selects for felix's team
up,down,up,down,left,right,left,right,up,down,left,right,
up,select for isaac's team.
Thank u