A naturally formed underground tunnel. Because it has not been developed, it is inky dark inside. A light is needed to get through.FRLG A dark tunnel that begins in Lavender Town and comes out in Cerulean City.HGSS A large natural tunnel. It's pitch black, so a light source is required.PE
The Rock Tunnel (Japanese: イワヤマトンネルRock Mountain Tunnel) is a naturally formed underground tunnel. Since it has not been developed, it is pitch black inside. A light of some sort is needed for travelers to find their way, so it is recommended that Pokémon Trainers bring along a Pokémon that can use Flash outside of battle.
Rock Tunnel is the only alternative route to Lavender Town, as the two other routes have been rendered inaccessible by a slumbering Snorlax and the Saffron City gatekeepers. The cave has two separate floors, both of which are roughly the same size. There are many Trainers within the cave, there for the fun of exploring, training, or are simply lost in the darkness.
Route 10 leads from Cerulean City to Rock Tunnel. At the northern entrance of the cave is a convenient Pokémon Center. The roof of the Kanto Power Plant can also be seen from here (excluding Generation III). The southern entrance exits onto the remainder of Route 10, leading to Lavender Town.
The name Rock Mountain (Japanese: イワヤマIwayama) has been sometimes used to refer to the mountain where the tunnel is located, as well as its surroundings. It appears as one of the areas in Pokémon Pinball and is used in Pocket Monsters Encyclopedia to refer jointly to Route 9 and the northern part of Route 10. In Pokémon Adventures, a three-chapter storyline spanning from Can't Catch Caterpie! to The Primeape Directive is stated to be set in a place called the Vast Plains of Rock Mountain (Japanese: イワヤマの荒野Iwayama Wasteland) by the Adventure Map at the end of the volume.
In Nintendo Power #125 (page 111), this is known as Rock Cave.
B1F, sometimes found by the player's walking Rock-type Pokémon from a crevice in a rock near the southwest corner of the floor, accessible from the northeasternmost ladder on 1F
1F, sometimes found by the player's walkingGround-type Pokémon in the sand patch south of the north entrance to the cave (Item determined randomly)
1F, sometimes found by the player's walking Ground-type Pokémon in the sand patch south of Hiker Claus (Item determined randomly)
B1F, sometimes found by the player's walking Ground-type Pokémon in the sand in southeast corner of the floor, on the northeastern patch of sand, near the ladder (Item determined randomly)
B1F, sometimes found by the player's walking Ground-type Pokémon in the sand patch on the western wall, southwest of Black Belt Steve (Item determined randomly)
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
One of the Poké Maniacs in the tunnel makes a reference to Mobile Fighter G Gundam, saying "Pokémon Fight! Ready, Go!" prior to battle. Official Gundam Fights in the series began with both participants declaring "Gundam Fight! Ready, Go!"
Rock Tunnel is the only one of Kanto's caves to appear in each of the first four generations with the same background music.
Morning (Kangaskhan)
Day/Evening (Marowak)
Night (Onix)
FRLG
