Terabyte672 | Final Fantasy VI Advance: Boss 68 - Holy Dragon Redux @Terabyte672 | Uploaded August 2008 | Updated October 2024, 2 hours ago.
This boss isn't really that hard at all; just go with the classic Quick/Ultima dualcasting bit. However, you should definitely watch out for Heartless Angel, because if he uses that and Saintly Beam and you haven't cast Reraise on anyone, you have officially been pwned.

Victory will net you Cyan's best katana, the Zanmato.