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BW134 : The Journalist from Another Region!
Best Wishes series
BW136 : A Pokémon of a Different Color!
Mystery on a Deserted Island!
BW135   EP792
Mystery of the Treasure! Deserted Island Adventure!!
First broadcast
Japan July 25, 2013
United States October 19, 2013
English themes
Opening It's Always You and Me
Japanese themes
Opening 夏めく坂道
Ending 手をつなごう
Animation Team Kato
Screenplay 大橋志吉 Yukiyoshi Ōhashi
Storyboard 古賀一臣 Kazuomi Koga
Assistant director 古賀一臣 Kazuomi Koga
Animation director 夏目久仁彦 Kunihiko Natsume
No additional credits are available at this time.

Mystery on a Deserted Island! (Japanese: お宝の謎!無人島アドベンチャー!! Mystery of the Treasure! Deserted Island Adventure!!) is the 135th episode of the Best Wishes series, and the 792nd episode of the Pokémon anime. It first aired in Japan on July 25, 2013 and in the United States on October 19, 2013.

201 Spoiler warning: this article may contain major plot or ending details. 201


When Alexa shows our heroes a mysterious treasure map linked to their next stop on Frond Island, everyone is very excited! She tells them the story of a pirate, his Pokémon (Shiftry, Nidoking, Mismagius, Honchkrow, and Vulpix), and the unknown treasure his ship contained. Jessie, James, and Meowth, who have been eavesdropping on our heroes’ conversation, decide to wait patiently until the Twerps find the treasure so they can steal it—and Pikachu too, of course...

Alexa takes Ash, Iris, and Cilan by boat to a small, deserted island nearby. After a narrow escape from a whirlpool, they find a hidden inlet that leads them through some tall cliffs as three Honchkrow keep a watchful eye on them. There, decaying on a beach, is a very old pirate ship! But Team Rocket has been following them underwater in a pedal-powered submarine, and when the villains surface too quickly, they ram the ancient ship by accident, sending it slithering back into the depths.

Ash is afraid the treasure went down with the ship, so he’s relieved when Alexa spies a door covered with symbols that resemble the ones on her treasure map! Cilan moves the symbols around to match the map, and the door opens to reveal a staircase.

At the top of the stairs is a dense forest, where our heroes are attacked by two Mismagius, then a Nidoking, and then three Shiftry! Alexa starts to put the pieces together and realizes that the Pokémon who have been attacking them match the story of the pirate and his crew! But they haven’t seen a Vulpix yet...

On the mountaintop, they find four Pokémon statues and one empty pillar. Then, the final Pokémon attacks—it’s a Ninetales, who must have evolved from the Vulpix they’ve been looking for! After they drive off the Ninetales, they discover the fifth statue and the secret entrance at its base. Sensing an opportunity, Jessie, James, and Meowth finally show themselves and prepare to battle our heroes for the treasure—but they’re all tired out from fighting the island’s Pokémon, and they’re quickly sent blasting off with nothing.

Sure enough, there’s a treasure chest inside the final statue, and it holds an amazing hoard of Evolution Stones! Our heroes and Alexa then realize the Pokémon that attacked them were protecting this treasure. Alexa decides to delete her records of this adventure, and everyone agrees to keep the island a secret, for the good of the Pokémon that live there. They return to the ship to continue their journey through the Decolore Islands and ultimately to Kanto!


090Shellder.png This plot summary is incomplete.
Please feel free to edit this plot summary to add missing sections and complete it.
Ash and his friends are joined by Alexa, an expert reporter from the Kalos region, and her Pokémon Helioptile and Gogoat. They stop by an Deserted Island rumored to have a secret treasure. What mysterious treasures will they find there? And is there a theme to the Pokémon on this island?

Major events

For a list of all major events in the anime, please see the timeline of events.


Pokémon debuts



Dare da?


Who's That Pokémon?

Who's That Pokémon?: Nidoking (US and international) Vulpix (Japan)

In Cilan and Alexa's demonstration



  • In a demonstration by Cilan and Alexa to show what Pokémon can evolve from Stones, Nidoking is shown to use a Moon Stone to evolve from Nidoran♂ instead of Nidorino.
  • After one of the Eevee evolved into Vaporeon, Vaporeon's ruff is cream-colored instead of white.
  • When the three Shiftry first appear, one is colored completely black. The next time they appear, they are all colored normally.

Dub edits

In other languages

BW134 : The Journalist from Another Region!
Best Wishes series
BW136 : A Pokémon of a Different Color!
Project Anime logo.png This episode article is part of Project Anime, a Bulbapedia project that covers all aspects of the Pokémon anime.