Here's how to find them:
1. Obtain the National Pokedex: This is required to be able to catch the legendary Pokémon. You can get it from Professor Elm after catching at least 60 Pokemon.
2. Use the Radio: Tune your radio to Channel 4. Listen for a specific sound. Each of the Legendary Pokémon has a unique sound that will play on the radio whenever they are in a certain area.
3. Search the Map: Each Legendary Pokémon has a specific area they roam in. When you hear their sound on the radio, use the map to figure out where they are.
Finding Raikou:
* Radio sound: A growling sound.
* Area: Roams around the eastern portion of Johto, including Ecruteak City and the surrounding area.
Finding Entei:
* Radio sound: A roar.
* Area: Roams around the western portion of Johto, including Goldenrod City and the surrounding area.
Finding Suicune:
* Radio sound: A wind sound.
* Area: Roams around the northern portion of Johto, including Mahogany Town and the surrounding area.
Tips for catching them:
* Use a Master Ball: The Master Ball is a guaranteed catch, so save it for one of the Legendary Pokémon.
* Use a strong Pokémon: They are very powerful, so it's recommended to have a high-level Pokémon with strong moves.
* Use status moves: Moves like Thunder Wave or Sleep Powder can help you weaken them before catching them.
* Be patient: It may take some time to find and catch them.
Good luck catching the Legendary Pokémon!