Pokémon Red and Blue/Rock Tunnel

New Pokémon Available

Red	Blue	Yellow
Machop Onix		Onix

Rock Tunnel is the only way to get from Route 10 to Anus 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.

File:Pokemon RBY RockTunnel F1.png

Rock Tunnel Floor 1

1	Pokémaniac	1150
	Cubone	LV23
	Slowpoke	LV23
2	Hiker	665
	Geodude	LV19
	Machop	LV19
	Geodude	LV19
	Geodude	LV19
3	Hiker	700
	Onix	LV20
	Onix	LV20
	Geodude	LV20
4	Hiker	735
	Geodude	LV21
	Graveler	LV21
5	Jr. Trainer♀	440
	Bellsprout	LV22
	Clefairy	LV22
6	Jr. Trainer♀	380
	Pidgey	LV19
	Rattata	LV19
	Rattata	LV19
	Bellsprout	LV19
7	Jr. Trainer♀	400
	Meowth	LV20
	Oddish	LV20
	Pidgey	LV20

Rock Tunnel 1F encounters

Zubat	55%	55%	55%
Geodude	25%	25%	35%
Machop	15%	15%	10%
Onix	5%	5%	N/A

Into the dark

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 Repel, which keeps weak Pokémon at bay.

If your starter Pokémon was Bulbasaur or Squirtle you'll have a much easier time. Bring a few Ethers, Potions, and maybe a Revive or two to make sure you can get through in one trip.

You'll have a very difficult time, however, avoiding the many trainers lurking in the shadows. You'll have to use Flash if you want to see where you're going in here. It's possible to proceed without it, but you'll probably want the light so you can avoid some of this area's tedious, difficult trainer encounters. 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.

File:Pokemon RBY RockTunnel B1.png

Rock Tunnel Basement 1

1	Pokémaniac	1250
	Slowpoke	LV25
2	Jr. Trainer♀	440
	Oddish	LV22
	Bulbasaur	LV22
3	Pokémaniac	700
	Charmander	LV22
	Cubone	LV22
4	Hiker	875
	Geodude	LV25
5	Hiker	700
	Machop	LV20
	Onix	LV20
6	Jr. Trainer♀	420
	Jigglypuff	LV21
	Pidgey	LV21
	Meowth	LV21
7	Hiker	735
	Geodude	LV21
	Geodude	LV21
	Graveler	LV21
8	Pokémaniac	1000
	Slowpoke	LV20
	Slowpoke	LV20
	Slowpoke	LV20

Rock Tunnel B1 encounters

Zubat	50%	50%	45%
Geodude	26%	26%	25%
Machop	15%	15%	20%
Onix	9%	9%	10%

#66 Machop

#95 Onix

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 26, and then into Machamp once they're traded. Hitmonlee is probably a better option, especially if you can't trade, but Machop is available earlier.

Onix is a decent Rock-type Pokémon to have. It has exceptional Defense and decent Speed, but rather poor HP, Attack, and Special Defense, making it rather susceptible to Water attacks. It suffers from a lack of good move choices, 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.