From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon: The Adventures in the Orange Islands is the name of the second season of the Pokémon anime. The 34-episode season showcases the adventures of Ash, Misty, and Brock in the Orange Islands, from Valencia Island up to Pallet Town.
It originally aired as part of the 2000 Kids' WB! Saturday morning line-up. The season began with A Scare in the Air, which originally aired on January 8, 2000, and ended with The Rivalry Revival, which originally aired on October 14, 2000.
The Adventures in the Orange Islands marked the beginning of the filler arch that spans between the Indigo League and the Johto saga.
It should be noted that the concept of seasons does not exist in Japan. An invention of the dub, a season is the only way to differentiate one story arc, such as Journeys, from any other in the Pocket Monsters series.
The following Pokémon are obtained:
Ash defeats the following Gym Leaders:
Ash defeats the Head Leader: