Use unknown magic:
Note: Save the game before using this code since it may cause the game to
freeze or act erratically. Enter the magic menu during a battle and
continuously tap Up. The pointer will eventually enter an area of the
screen that will allow magic that has not been learned yet to be selected.
Multi-player mode:
Collect a Channel Ring and equip it on the character below Stahn. Press
Select on controller two to use that port to control that character. Note:
Repeat this code on other characters to use more controllers and a
multi-tap to control up to four characters manually in the game.
Sites: