Wisdom Form Leveling
The best way to level up your Wisdom Form is the areas before Organization XIII's Castle on the World That Never Was, such as the Memory's Skyscraper and the areas before it. The Heartless spawn in threes and continue to spawn after you kill them for several minutes, and since Wisdom Form gains EXP from the Heartless you kill while in Wisdom Form, it makes getting Wisdom Form up in levels very easy.
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