Go through the level until you're near the end, coming up towards the Magnemite. Look to the right and you will see a lone Electrode, throw an apple at it and it will explode, knocking down the tunnel wall and opening the path to the volcano level.
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i caught mine on the path from Cerulean city to Rock Tunnel
Tunnel #4 is in Rivet Ravine. The entrance to the Secret Tunnel is in Tunnel #4. It's hard to miss, it looks exactly like the hole in the Digadigamid where you first meet Nevada. It doesn't appear at first, though. You have to do a bit in the game (passing time) before it opens. And then after that, Here's what happens in the secret tunnel and how to solve it: Secret Tunnel 1: The mole wants your help to find it's friend. Secret Tunnel 2: Follow the O path (not the X path) 3 times to move on. Secret Tunnel 3: Don't open the treasure box, follow the main path 3 times. Secret Tunnel 4: Talk to the mole and return to the enterance.
The fourth Pokemon Gym is located in Celadon City. Celadon City can be accessed by heading right on Route 5, the path that connects Cerulean and Vermillion City. You will need the HM Cut to clear a tree blocking your path, and from there there is a straight path to the Rock Tunnel. This is a cave similar to Mt. Moon that you will need HM Flash to navigate through. After getting out of the Rock Tunnel you will arrive in Lavender Town. From there, Celadon City is to the left. The fourth gym is at the lower left corner of Celadon City. The leader is Erika who specializes in Grass types.
You mean the one blocking you by the bridge near Vermilion City? Its a Pokemon called Snorlax and can be only woken up by something called a Pokeflute. To get to Lavender Town, Snorlax is blocking your way BUT there is another way. Beat Gym Leader Misty (Cerulean City) and get cut from the S.S. Anne Shipmaster. Cut the tree to the right in Cerulean. Keep following that path with all those trainers and get to Rock Tunnel. After you go through rock tunnel, Keep following the path downwards and Lavender Town's there!Pokeflute is located in Pokemon Tower
near the Pokemon league