Following town:

As you look around, there's two things to note:

First building you come across is the Pokemon Center, which'll also have the Pokemart and PC area. Your guide will explain a bit before letting you continue.
The house near the water will give you a Fishing Rod. Your guide will take you to the water and teach you about finishing.

Pokemon caught by fishing here:
Magikarp

You can continue looking around or head for the next area.

Next route has nothing special. Just pokemon and trainers.

Pokemon:
Starly
Ratata
Murkrow
Shinx
Seedot
Rufflet
Marill

Trainers:

Bug Trainer
~Scatterbug
~Sewaddle
~Paras

School Girl
~Deerling
~Misdreavus
~Klang

Breeder
~Stunky
~Eevee
~Burmy

Afterwards, you can head for the next town.