Pokémon Red and Blue/Route 9-10

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New Pokémon Available
Red Blue Yellow
Route 10:
Voltorb
Route 10:
Magnemite
Machop

Using the Cut ability, chop your way through to Route #9 from Cerulean City. Check into the Pokémon Center near the entrance to the Rock Tunnel, then plunge into the underground passage. It emerges on Route #10, a very short route to your next destination, Lavender Town. This might seem like a roundabout way to get there — but it's the only way.

Route #9
1Jr. Trainer♀File:Pokebuck.png360
OddishLV18
BellsproutLV18
OddishLV18
BellsproutLV18
2HikerFile:Pokebuck.png700
MachopLV20
OnixLV20
3Jr. Trainer♂File:Pokebuck.png420
GrowlitheLV21
CharmanderLV21
SandshrewLV24
4Bug CatcherFile:Pokebuck.png190
BeedrillLV19
BeedrillLV19
A TM 30
5Bug CatcherFile:Pokebuck.png200
CaterpieLV20
WeedleLV20
VenonatLV20
6Jr. Trainer♂File:Pokebuck.png380
RattataLV19
DiglettLV19
EkansLV19
SandshrewLV19
7HikerFile:Pokebuck.png735
GeodudeLV21
OnixLV21
8HikerFile:Pokebuck.png700
GeodudeLV20
MachopLV20
GeodudeLV20
9Jr. Trainer♀File:Pokebuck.png460
MeowthLV23
Route #9 encounters
Spearow 35% 35% 20%
Fearow N/A N/A 4%
Rattata 40% 40% 20%
Raticate N/A N/A 8%
Ekans 25% N/A N/A
Sandshrew N/A 25% N/A
Nidoran♂ N/A N/A 16%
Nidorino N/A N/A 8%
Nidoran♀ N/A N/A 16%
Nidorina N/A N/A 8%
Route #10 encounters
Spearow 30% 30% N/A
Sandshrew N/A 30% N/A
Rattata 15% 15% 20%
Raticate N/A N/A 10%
Ekans 30% N/A N/A
Nidoran♂ N/A N/A 12%
Nidoran♀ N/A N/A 12%
Machop N/A N/A 18%
Magnemite N/A N/A 28%
Voltorb 25% 25% N/A

[edit] Before the tunnel

The encounters here are annoying, but at least many of them can be avoided and there's a Poké Center at the end. Make sure you have your Cut-knowing Pokémon with you, or the HM and a Pokémon who's willing to learn.

Before you enter the tunnel, hack aside the top bush and search beneath it for a Super Potion.

Route #10 (North end)
#100 Voltorb #81 Magnemite
Voltorb appear entirely like Poké Balls. Despite being Electric type Pokémon, they learn no Electric attacks naturally without the aid of TMs. Rather, they learn Normal attacks including the life sacrificing Selfdestruct. Once learned, this move should only be used in an emergency.
The Magnemites in Yellow aren't as fast as their Voltorb cousins in Red/Blue, but their mix of strong Electric skills and Normal attacks are more versatile than the Normal-only skills of Voltorbs.
Power Plant
The Power Plant is visible from Route #10, but you can't reach it just yet. Sometime later, you'll obtain a Hidden Machine that will enable you to use the Surf technique. You'll be able then to travel along the stream that flows past both Route #10 and the Power Plant. Until then, you'll just have to keep your curiosity in check.
Route #10 Fishing
(Super Rod)
Poliwag -
Slowpoke -
Horsea - -
Krabby - -
Kingler - -
1Jr. Trainer♀File:Pokebuck.png360
PikachuLV20
ClefairyLV20
JigglypuffLV20
ClefairyLV20
A Super Potion