Instructions
Travel to Mt. Silver, which is located in the Johto region near the center of the large continent on your map. Mt. Silver is located west of Viridian City and southwest of Indigo Plateau. This should be done after you have already faced the Elite Four. Mt. Silver is the game's final challenge.
Enter Mt. Silver. One of your Pokemon should know the ability "Rock Climb" to get through the cave. Navigate through the cave until you reach the Mt. Silver Summit. Walk to Red and speak to him to initiate a battle. Defeat Red.
Release the Pokemon Latios if you have it. Leave one spot in your Pokemon party empty and travel to Saffron City, located in the Kanto region. The Kanto region is located near along the south-central shoreline of the large continent on your map. Saffron City is located north of Vermilion City and east of Celadon City.
Enter the Silph Co. building in Saffron City and travel to the right of the building. Speak to Steven Stone. He will offer you a choice from among three Pokemon, including Torchic, Mudkip and Treecko. Select Torchic.