Auf Ihrem Weg nach Trostu kommen unsere Helden zu einem wunderschönen Anwesen, dessen Besitzer ein Mann namens Matthew ist. Eine angehende junge Detektivin, Marble, und ihr Luxtra bewachen dort Matthews wertvollen Talisman. Luxtra scheit ein sehr wütendes Pokémon zu sein, es nimmt keine Befehle an. Anfänglich hält Marble Ash und seine Freunde für die Diebe, die sich die "Drei Schönen Banditen" nennen…
Ash and friends are lost while on the trip to Solaceon Town. They find a mansion nearby and decide to check it out. When they approach they are attacked by an young girl named Marble, her Luxray, and a bunch of security guards, who believe they are thieves. The owner comes out and the misunderstanding in resolved. The owner, Matthew, reveals that three criminals want to steal his treasure the Old Charm, at 8:00. Ash, Dawn, and Brock agree to help out. It turns out that Team Rocket are the thieves, and they make off with the treasure. Their plan ends abruptly when their balloon pops and crash lands in another part of the mansion. Everyone heads to get there, but Team Rocket falls prey to the mansion's traps. Now it is up to Ash, Dawn, Brock, and Marble to find Team Rocket and get the Old Charm back, but with a mansion full of traps and a disobedient Luxray, that may be harder then planned.
Ash, Dawn y Brock son confundidos con ladrones y atacados por una aprendiz de detective llamada Marble y su Luxray. Luego de aclarar el malentendido, los chicos se quedan para ayudar a capturar a los verdaderos ladrones.
旅の途中、森の中で道に迷ってしまったサトシたちは、地図にも載っていない古いお城を見つけ泊めてもらうことに。そこで、天才探偵を名乗る少女マーブルと"がんこうポケモン"のレントラーに出会う。どうやら怪盗3（スリー）ビューティーズがお城にあるお宝「こだいのおまもり」を狙っているらしく、サトシたちは怪盗と間違われてしまったのだ。そこへお城の主マシューが現れ、はやとちりなマーブルを手伝ってほしいと頼まれるのだが・・・サトシたちは無事お宝を守りきることが出来るのか！？ 3ビューティーズの正体とは！？ そのとき、3ビューティーズの影が忍び寄る！！
