Going through Route 9 is necessary to reach Route 10, but it can only be accessed by having a Pokémon that knows Cut. In addition, make sure to pick up Flash from Route 2 before going into the Rock tunnel, 'cause it's going to be dark.
This route is East of Cerulean City, and contains the entrance to the Rock Tunnel. Going through Rock Tunnel may seem like a roundabout route, but it's the only way, as there is a Snorlax blocking Route 12 and the thirsty officer blocking Saffron City will not let the player in.
Route 10 leads to '''Rock Tunnel'''. The tall grass in this route contains one of the very few electric-type Pokémon available so far in the game.
As a side note, remember to return to this area once you have the ability to Surf, as the waters here will lead you into the Power Plant, and a powerful Legendary!
It's useful to have picked up '''HM05 {{bpm|Flash}}''' from one of Professor Oak's aides in Route 2, accessible through Diglet's Cave, before going into Rock Tunnel, as it's a dark tunnel, the only in the game like this. Going through Rock Tunnel is the only way to progress at this point, as there is a {{bp|Snorlax}} blocking Route 12 and a thirsty guard blocking Saffron City's gate.
==Professor Oak's Aide==
Inside the Pokémon Center near Rock Tunnel is another of Professor Oak's aides. If you have complete data on 20 different species of Pokémon, they will reward you with an Everstone, an item to be held by a Pokémon that prevents it from evolving. Obscurely, Pokémon may learn certain different moves by delaying evolution, although normally it's not needed at all.
Inside the Pokécenter you will find one of Oak's Aides. Talk to him and, if you have complete data on 20 types of Pokémon, he will reward you with an '''Everstone''', which can be held by a Pokémon to prevent it from evolving.
You will leave this route leaving behind a water path left to be explored at a later point, by backtracing.
| [[File:Pokemon 100Voltorb.png|right]] If you missed catching a Pikachu while you were in the Viridian Forest, this is the only Electric pokemon you'll see until you can visit the Power Plant with surf. Voltorb's only offensive Electric move is spark at level 21, which while good can't compare to Thunderbolt, which Pikachu gets at 26. It's a good idea to pick up the TM from Rocket Game Corner in Celadon City if you plan on making Voltorb your primary Electric type. If you already have a Pikachu you may choose to skip this Pokemon.
Other than Pikachu in Viridian Forest, this is the only electric-type Pokémon you'll see until you can visit the Power Plant. {{bp|Voltorb}}'s only offensive electric move is {{bpm|Spark}}, at level 21, so it needs to be taught some moves to get better. It's a good idea to pick up a TM from the Rocket Game Corner in Celadon City if you plan on making Voltorb your primary electric-type. Voltorb evolves into {{bp|Electrode}} starting at level 30.}}
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Route 10 leads to Rock Tunnel. The tall grass in this route contains one of the very few electric-type Pokémon available so far in the game.
It's useful to have picked up HM05 Flash from one of Professor Oak's aides in Route 2, accessible through Diglet's Cave, before going into Rock Tunnel, as it's a dark tunnel, the only in the game like this. Going through Rock Tunnel is the only way to progress at this point, as there is a Snorlax blocking Route 12 and a thirsty guard blocking Saffron City's gate.
Inside the Pokémon Center near Rock Tunnel is another of Professor Oak's aides. If you have complete data on 20 different species of Pokémon, they will reward you with an Everstone, an item to be held by a Pokémon that prevents it from evolving. Obscurely, Pokémon may learn certain different moves by delaying evolution, although normally it's not needed at all.
You will leave this route leaving behind a water path left to be explored at a later point, by backtracing.
Other than Pikachu in Viridian Forest, this is the only electric-type Pokémon you'll see until you can visit the Power Plant. Voltorb's only offensive electric move is Spark, at level 21, so it needs to be taught some moves to get better. It's a good idea to pick up a TM from the Rocket Game Corner in Celadon City if you plan on making Voltorb your primary electric-type. Voltorb evolves into Electrode starting at level 30.
