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Diancie appears as a princess in Diancie and the Cocoon of Destruction where she was unable to produce a Heart Diamond in order to save the diamond domain. She needed more power to create real diamonds and at the moment, her diamonds lasted for five minutes only. On elders' advice, she went on search of Xerneas to obtain Fairy Aura to form a Heart Diamond. However three thieves chased her in order to get diamonds.
When Ash and co. met her, they decided to help her to get to Xerneas. But they were interrupted many times by thieves. However they managed to reach to a forest where the cocoon of destruction, Yveltal resided. Due to continuous disturbance, Yveltal woke up and went on rampage and started to destroy everything by draining their life energy and turning everything to stone. Diancie vowing to never give up was able to mega evolve and created large diamond blocking Yveltal's power.
Later, Diancie thanks Ash and his friends and Bonnie gives her the diamond she made for her early and that never disappeared to remember the times they had together. She later waves goodbye to Ash and friend as they continue their journey.
|Diamond Storm||Diancie and the Cocoon of Destruction|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
- Diancie was the second anime legendary Pokemon to be a leader of it's own Pokemon. The first one being Manaphy (AKA "The Prince Of The Sea") from "Pokemon Ranger And The Temple of The Sea" movie.
- However , Princess Diancie is currently the only anime legendary Pokemon to be an actual royal Pokemon in the movie, as Manaphy from "Pokemon Ranger and The Temple of The Sea" was never an actual prince to begin with, since it has an ambiguous gender, despite it being called "Prince Of The Sea".