How to unlock the true 100% ending - Paper Mario: The Origami King

Are you looking for the true 100 percent ending to Paper Mario: The Origami King? It

Paper Mario: The Origami King: 15 Things To Do After You Beat The Game

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Paper Mario: The Origami King — How to unlock the secret ending

I 100%ed Origami King and I didn't get the secret end, what am I doing wrong? : r/papermario

my tier list : r/papermario

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Paper Mario: The Origami King - Super Mario Wiki, the Mario encyclopedia