Pokémon Chronicles - Season 1 - Eps 10: Showdown at the Oak Corral
At Professor Oak's lab, Tracey and the Professor are busy with their daily work. So busy that they don't even notice when a Team Rocket helicopter lands on the property—Butch and Cassidy are here, and they plan to steal all the stored Pokémon from the lab! While Ash's mom Delia stops by to say hello to Professor Oak, Butch and Cassidy put on Pokémon disguises and make their way toward the lab. The local Pokémon take an interest in these new visitors, thinking they're real Pokémon, but an Oddish realizes the newcomers are just people in costumes. Oddish alerts Bulbasaur, who decides to take action. It grabs Tracey and sends Noctowl to scout the area for signs of the intruders. By the time Tracey realizes what's going on, Butch and Cassidy have already looted the Poké Balls from the lab and left the building. Now they're back in their Pokémon disguises and headed for the helicopter, but they're slowed down by a lovestruck Nidoking and an affectionate Muk.
About Pokémon Chronicles

Title: Pokémon Chronicles
First Air Date: 1998-12-22
Last Air Date: 2004-09-28
Status: Ended
Rating: 7.948/10 (from 184 votes)
Language: JA
Seasons: 1
Total Episodes: 22
Network: TV Tokyo
Genres: Animation, Kids
Production Companies: OLM, TV Tokyo, Shogakukan Production
Synopsis
Pokémon Chronicles, partly known in Japan as Pocket Monsters Side Stories, is a spin-off series of the Pokémon anime, revolving around characters other than Ash Ketchum.
Cast

Yuji Ueda

Miyako Ito

Mayumi Izuka

Yuko Kobayashi

Tomokazu Seki

Kenji Nojima