This little segment connects Pokémon Road with Fuchsia City. As you come from Route 17, there will be flower beds on both sides. Go left and search the second bunch of flowers for some hidden silver berries. After that, go down and follow the path east. Eventually, you’ll reach a gatehouse. Go upstairs if you want.
Through the gatehouse, you’ll arrive back in Route 18, near the Fuchsia City side. A short distance to the right, there’s a gap in the wooden fence that you can go through. But be cautious of the territorial Bird Keepers standing guard. He will swap between looking right and down, so you can skip past him if you’re good.
Bird Keeper Wilton
Get those Electric, Rock and Ice-types ready! Wilton’s Fearow knows Drill Run, so Electric and Rock-types should be cautious. Likewise, his Dodrio has Jump Kick, which can hurt Rock-types a little.
On the other side, there’s a patch of tall grass that’s home to lots of bird Pokémon. To the left, along the bottom, there’s another Bird Keeper. You can avoid him by staying near the top.
Bird Keeper Ramiro
Ramiro has a fully evolved Pidgey. But it seems he neglected to teach it many moves, as it simply spams Air Slash all day. Hmm, what if you used Disable to stop it using Air Slash?
Further left is the third and final Bird Keeper. You should be able to avoid him if you don’t go right in front of him. Or to be safe, you can hang around near the bottom. Anyway, to his left is an Elixir. Those are pretty handy to have during long journeys!
Bird Keeper Jacob
A Farfetch’d fan, huh? That seems kind of… farfetched. Sorry. Anyway, the first two Farfetch’d have priority moves. So expect them to attack first. Meanwhile the last one has Sky Attack, which requires a turn to charge. You should be able to KO it easily before it can use it.
When you’re ready to move on, head east from the gatehouse. You’ll arrive in Fuchsia City, where you can sit back for a while.
Exactly the same Pokémon from Route 16 in the tall grass. Before you enter the gatehouse, there’s a body of water along the south where you can encounter the starfish Staryu and, if you’re really lucky, its evolved form Starmie. If you somehow don’t have a Water-type, these aren’t bad choices.