Pokemon - episode 80 - 06 Jan, 1999

Ash meets a new trainer named Ritchie, who is eerily similar to Ash, including owning a Pikachu. However, Team Rocket makes another attempt to steal Ash's and Ritchie's Pokémon. Ash and Ritchie prevent Team Rocket from stealing their Pokémon. Ash discovers his next battle is against Ritchie. (Source: Wikipedia)