Whale Zombies are great sources of EXP once the player can access Lost Continent and Outer Continent beaches with the Blue Narciss. A physical character with both the Undead Killer and Bird Killer abilities can make short work of this cetacean. Also, as the Whale Zombie is undead, casting Life or Full-Life on it will defeat it instantly. However, the player must beware of the exceptionally dangerous Zombie Powder and Venom Breath attacks, which inflict debilitating status effects.
It should be noted that Whale Zombie is a very good enemy to Eat with Quina to teach him/her Lv5 Death, which will be essential for leveling up later in the game against Grand Dragons. As it is undead, the Whale Zombie can be reduced to 1 HP with a Phoenix Down, easily putting it in range to be eaten.