Cerulean City is the town of water. Home to Misty's gym, it's an important stop on the road of a Pokemon trainer. It is also a densely populated area when it comes to wild Pokemon. There is a path to the north, which leads to a lake, and ultimately, a dead end, but contains many different types, and a path to the south which leads to Vermillion City.
Available Pokemon (North):
Pidgey
Pidgeotto
Ekans
Sandshrew
Nidoran Male
Nidoran Female
Oddish
Bellsprout
Venonat
Meowth
Psyduck
Poliwag
Tentacool
Slowpoke
Abra (Rare)
Available Pokemon (South)
Pidgey
Pidgeotto
Sandshrew
Cubone
Shellder
Staryu
Magikarp
Scyther(Rare)