A Faux Oak Finish! (Japanese: オーキド博士を救出せよ！ニョロトノＶＳグレッグル！！Rescue Dr. Okido! Nyorotono VS Gureggru!!) is the 139th episode of Pokémon the Series: Diamond and Pearl, and the 605th episode of the Pokémon anime. It first aired in Japan on August 20, 2009 and in the United States on January 9, 2010.
It’s the first day of the Twinleaf Festival, and Professor Oak is scheduled to give a lecture on “the interrelation of Pokémon and Evolution stones.” But a flat tire forces him to make a stop near a marshland, where he discovers a wealth of Pokémon! While there, he helps one of the Pokémon, a Lombre, evolve into a Ludicolo using a Water Stone.
Meanwhile, Team Rocket has decided that a great way to capitalize on the upcoming lecture is to sell Oak memorabilia—with James dressed up as the spitting image of Professor Oak to do the selling!
While waiting for Professor Oak to arrive, the festival committee—that is, Johanna, Izzy and Cara—mistakes James for the real Professor Oak and drags him to the lecture. Jessie and Meowth secretly convince James it’s a golden opportunity to steal the audience’s Poké Balls! Suddenly the real Professor Oak bursts in with Ash and friends, and everyone must figure out who in fact is the real Professor Oak...
But an ailing Tyranitar sends James blasting off again, and the real Professor Oak heals the Tyranitar by removing a thorn from its foot. This leaves the hapless Team Rocket with no Poké Balls, which proves who the real Professor Oak is!
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Meanwhile, the real Professor Oak is standing by while his assistant is replacing his tire on the car. Oak sees a marsh ahead of him and wanders off to see what Pokémon are in it. His assistant tells him not to go too far, but he says that he is just going to look around.
Ash and his friends are running down the path and find the assistant without Professor Oak. The assistant tells them that Oak is out in the marsh and the others go after him. Dawn warns that she has heard that the marsh is full of quicksand.
James is getting ready to begin a speech for all the kids out in the crowd. He tries to escape a couple of times, but he is caught.
Professor Oak is walking through the marsh and sees a Poliwhirl. He makes up a poem about it and sees a Politoed walk out of the bushes. He goes over to look at it when two Quagsire walk up next to him. He also makes a poem about them. Ash and friends are walking up and waving when the Quagsire pick Oak up and run off, following the Politoed, much to everyone's confusion. As they begin to head off again, Dawn reminds them that there is quicksand around there. Piplup takes the lead, but quickly sinks into quicksand. Dawn sends out Buneary to use Ice Beam to save Piplup. Croagunk then takes the lead and begins to walk. Suddenly he stops, but Piplup keeps walking and falls into quicksand again. Croagunk quickly throws him out of it. Croagunk leads them to a cave, out of which comes Politoed followed by the Quagsire. Politoed challenges Croagunk to a duel which Croagunk wins. They walk into the cave to find Oak with a Lombre and two other Quagsire. Oak tells them that Politoed just wanted him to come give Lombre the Water Stone to help with the Pokémon's depression. Oak breaks off a small piece of the Water Stone and gives it to Lombre, which evolves it into Ludicolo and makes it happy again.
James walks out onto stage as his nerves begin to get to him and he won't say a word. Jessie and Meowth sneak over to the stage and tell James to think of this as a classic Team Rocket scheme to get tons of Pokémon. This encourages James and he begins to perform well. Meowth wishes they had thought of this sooner as James is able to collect all the Pokémon in the crowd. Ash and his friends then run in with Professor Oak behind them. Dawn says that James is not the real Professor Oak. James denies it, and a young boy from the crowd walks up and says that the real Professor Oak would be able to help him with his Pokémon, and sends out a Tyranitar. Izzy and Cara push James up, but he is promptly blasted off by Tyranitar, with Jessie and Meowth running after him. Oak then walks up to Tyranitar and pulls a thorn out of its foot, making it happy. The boy is happy and everybody in the crowd cheers.
Meanwhile, James is dangling from a tree, while Jessie and Meowth are trying to figure out how to get him down. Their boss, Sayer, then walks up, and James falls from the tree. Much to the trio's disappointment, Sayer orders them back to work.