Adelbert steiner I read ur hinty thing and heres how I defeated garland kuja and silver dragon.
Have zidane use normal attacks or trance powers if possible.
If u have the ragnarok sword 4 steiner equip him wth it(u find the ragnarok in 1 of the chocograph chests)and keep using sword art, shock have vivi use flare and amarant to throw good weapons and stuff.
This worked 4 all 3 bosses 4 me and I was even on a lower level than u.
I hope u defeat him.
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