After Rock Tunnel you must travel left to Celadon City. You need to defeat Erika and obtain your 4th badge to progress further in the game. You must also defeat Team Rocket who has a secret base in the Celadon City Department Store. If you do so you will receive the Silph Scope. With that you must head back to Lavender Town and nagivate through the Pokemon Tower (and have a fight wth Gary) and either defeat or capture the mother Marowak.
Chat with our AI personalities
Rock Tunnel is located due east of Cerulean City, around the corner from the pokecenter.
In Pokémon Red, Blue, and Yellow version you have to go through the Rock Tunnel. The best way to get through it is to use Flash.
In Rock Tunnel
rock tunnel
in soul silver