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Tales of Symphonia: Dawn of the New World | Wii
Mystic Art is a special art that wont become available until you see the word 'special' in your skills.
It costs 10 skill points to equip it so you really do have to decide what skills you want Emil to have. If you decide to use others as your lead character I have heard that Marta's is well worth it as not only is it powerful but it heals too.
You need to have a full gauge at the bottom of the screen when in battle. Hold down the B on your wii control and watch him kick major butt! (I find it doesnt always work on the first go!!)