Historical Mystery Tour! (Japanese: ネイティ、 ネイティオ。。。不思議な森！Naty, Natio... Mysterious Forest!) is the 140th episode of the Diamond & Pearl series, and the 606th episode of the Pokémon anime. It first aired in Japan on August 27, 2009 and in the United States on January 16, 2010.
Spoiler warning: this article may contain major plot or ending details.
Template:Incomplete synopsisAsh, Brock, and Dawn are walking with Johanna, enjoying the festival. Suddenly, Barry runs into Ash. Barry challenges Ash to a battle and they run off. Johanna tells Dawn to go with them and she runs off after them. Sayer asks if Brock will watch his stand for him, which Brock agrees to. Heracross and Pikachu are battling when a Xatu, flies over. Dawn looks it up on her Pokédex and Barry runs off following it with Ash and Brock in pursuit. As they catch up they see a big tent up ahead with a Grumpig and a Mime Jr are outside. A clown walks out and Ash, Dawn and Barry are caught up in a bright light.
Ash wakes up in a field of tall grass. He stands up and sees a Nidoking and a Nidoqueen battling. Ash wonders why they are so big then a big group of Combee fly over. An Aipom runs up a tree and they are all bigger than normal. A Skorupi walks by along with a pack of Mightyena. Ash runs after them but falls down a hole. As he gets back out a Natu runs by and Ash climbs out of the hole to follow it.
Dawn is standing along a river, calling for Ash and Piplup. She sees a Natu hop by and looks it up on her Pokédex. She wants to battle it but her Poké Balls are not working.
Barry is sitting on the edge of a cliff, watching a herd of Tauros and Dodrio graze.
This is the first episode featuring Barry where his Empoleon does not appear.
Interestingly, this episode aired the same week that Stopped in the Name of Love! aired in America. Both episodes had a scene where Dawn and Piplup had to deal with a group of Ariados, which also occurred in Following a Maiden's Voyage!, when Dawn and Piplup became friends.
