Pokémon Red and Blue/Route 9-10

'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.'



Before the tunnel
The encounters here are annoying, but at least many of them can be avoided, and there's a Pokémon 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.

Above Trainer #1 on Route #9 is a ledge with a tree on the right side. You'll have to go around to reach the tree, but examining it will net you an Ether.

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