Use summons during one of the finals battles in kingdom hearts
During the battle when you battle the enemy in the volcano in the end of the world world, when the battle starts go towards him and go to his feet or the top of the volcano, then before he creates the "ring of fire"
Simply land on the lava like surface of the volcano and summon whoever you wish (I would go with tinkerbell)
Or just land on the back of his head and do the same thing
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