He means Baigan. And yes, all you have to do to defeat Dark Cecil is to stand there.

Anyway, with Baigan, focus your attacks on the center, not on either of his arms. Have Tellah cast his strongest spells, same with Palom. Use Porom to heal, and Cecil on occasion if you need him. Have Cecil and Yang attack.

If that still doesnt work, then fall back on the age old rule. Go level up some more. I had no problems with Baigan.