Gizamaluke is a boss from Final Fantasy IX the party fights in Gizamaluke's Grotto. Master Gizamaluke is apparently being controlled by Zorn and Thorn, as he is normally supposed to be loyal to Burmecia. The player has to get the Holy Bell from Moguta, whom they gave the Kupo Nut earlier, to reach Gizamaluke.
Master Gizamaluke only has one attack that targets all of party members, Water, but it uses it fairly often. Gizamaluke uses Silent Voice to counter any offensive spells against it, inflicting Silence on the target.
The player should have Zidane cast Soul Blade if he has The Ogre equipped, as it will Blind Gizamaluke. Alternatively, if Zidane has mastered Soul Blade, he could also use the Butterfly Sword, which will inflict Silence on Gizamaluke, preventing use of Water. Freya should be Jumping or casting Lancer.
Vivi should cast Thunder, and can use Focus to increase its power. Vivi can also use Slow to decrease the rate Gizamaluke attacks. If Quina is in the party s/he can use the Mighty Guard, which can be learned from the enemies outside Gizamaluke's Grotto.
If possible, the player can use a Tent on Gizamaluke right at the battle's start, as there is a chance it will inflict Silence and Blind. There is also a chance it will fully cure him, so it is best used as soon as the battle starts as the battle can be troublesome for underleveled or inexperienced players.