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New Pokémon Available
Red Blue Yellow

Pokemon 066Machop.pngMachop
OnixPokemon 095Onix.png

Pokemon 095Onix.pngOnix

Rock Tunnel is the only way to get from Route 10 to Lavender Town. Unlike the caverns beneath Mt. Moon, Rock Tunnel is pitch black, and you must rely on the Flash technique (HM 05) to light your way. Use the labeled maps to follow the ladders through the tunnel to the exit. The tunnel has two levels, but there really is only one main path.

Floor 1: Into the dark[edit]

Rock Tunnel Floor 1
1 Pokémaniac Pokebuck.png1150
Cubone LV23
Slowpoke LV23
2 Hiker Pokebuck.png665
Geodude LV19
Machop LV19
Geodude LV19
Geodude LV19
3 Hiker Pokebuck.png700
Onix LV20
Onix LV20
Geodude LV20
4 Hiker Pokebuck.png735
Geodude LV21
Graveler LV21
5 Jr. Trainer♀ Pokebuck.png440
Bellsprout LV22
Clefairy LV22
6 Jr. Trainer♀ Pokebuck.png380
Pidgey LV19
Rattata LV19
Rattata LV19
Bellsprout LV19
7 Jr. Trainer♀ Pokebuck.png400
Meowth LV20
Oddish LV20
Pidgey LV20

The wild Pokémon in Rock Tunnel tend to attack more often than their above-ground cousins, and if you're being attacked every few steps, it may take you awhile to reach medical attention. For that reason, it's a good idea to bring either a Pokémon that knows Dig, or plenty of Escape Ropes just in case you need to make a quick getaway. If you don't have either of those, this would be a good time to try Repels, which keeps weak wild Pokémon at bay. However, Pokémon who are stronger in levels than your lead Pokémon can still ambush you.

If your starter Pokémon was Bulbasaur or Squirtle you'll have a very easy time against the Rock and Ground-type Pokémon that lurks here. There are also some trainers with Water-type Pokémon so Electric-type Pokémon does good against them. Bring a few Ethers/Elixirs, Potions, and maybe a Revive or two to make sure you can get through in one trip.

The cave is very dark and your screen will turn almost black so you won't see anything except for the walls that are bluish. The trainers aren't too tough here but you can accidentally run into them if you're not careful. You'll have to use Flash (HM05) if you want to see where you're going in here. It's possible to proceed without it, but if you do, hope you recognize where everything is. If you want to avoid a battle, walk a path that's far away from the trainer or that's out of the trainer's line of sight.

Rock Tunnel 1F encounters
ZubatPokemon 041Zubat.png 55% 55% 55%
Pokemon 074Geodude.pngGeodude 25% 25% 35%
MachopPokemon 066Machop.png 15% 15% 10%
Pokemon 095Onix.pngOnix 5% 5% N/A
Rock Tunnel B1 encounters
ZubatPokemon 041Zubat.png 50% 50% 45%
Pokemon 074Geodude.pngGeodude 26% 26% 25%
MachopPokemon 066Machop.png 15% 15% 20%
Pokemon 095Onix.pngOnix 9% 9% 10%

Basement 1[edit]

Rock Tunnel Basement 1
1 Pokémaniac Pokebuck.png1250
Slowpoke LV25
2 Jr. Trainer♀ Pokebuck.png440
Oddish LV22
Bulbasaur LV22
3 Pokémaniac Pokebuck.png1100
Charmander LV22
Cubone LV22
4 Hiker Pokebuck.png875
Geodude LV25
5 Hiker Pokebuck.png700
Machop LV20
Onix LV20
6 Jr. Trainer♀ Pokebuck.png420
Jigglypuff LV21
Pidgey LV21
Meowth LV21
7 Hiker Pokebuck.png735
Geodude LV21
Geodude LV21
Graveler LV21
8 Pokémaniac Pokebuck.png1000
Slowpoke LV20
Slowpoke LV20
Slowpoke LV20
#66 Machop #95 Onix
Pokemon 066Machop.png
They're not a common sight in any version, but anyone can track down and capture a Machop with a bit of effort. Machops are strong in Attack and HP and only get stronger as they evolve: into Machoke at level 28, and then into Machamp once they're traded, making it a good Pokémon for physical sweeping. They however have a rather poor Defense, Speed, and Special, making them easy targets for Psychic-type Pokémon, and the only considered powerful STAB move they have is Submission. Hitmonlee is probably a better option, especially if you can't trade, but Machop is available earlier and can still pack a punch.
Pokemon 095Onix.png
Rhydon and Golem are better choices for a Rock and Ground-type but Onix is still a decent Pokémon to have. It has a massive Defense and a mediocre Speed, but bad HP, Attack, and Special, making it rather susceptible to Water and Grass attacks. It suffers from a lack of good move choices, and it may be not so good at hitting hard, but it takes physical hits well. Note, however, that due to its strength, capturing an Onix with a regular Poké Ball is fairly difficult, even with low HP. If you have trouble capturing Onix, you might choose to return with stronger Poké Balls later on. Keep in mind, however, that despite its less impressive stature, Geodude's stats and movepool are superior.