Pokemon - episode 79 - 31 Dec, 1998

During the 4th Round, Gary ends up losing to a trainer named Melissa after Gary's Nidoking is defeated by Melissa's Golem. Meanwhile, Ash faces against his toughest opponent yet, a trainer named Jeanette Fisher (カオルコ, Kaoruko), who uses a Beedrill, a Scyther, and a Bellsprout. After a hard fought battle with Bulbasaur, Pikachu and Muk, the match ends with Ash victorious, and he moves on to the 5th round, becoming one of the final sixteen members of the tournament. (Source: Wikipedia)