Pokémon Gold and Silver/Route 40-41

Pokémon found
Break the rocks on the beach (use a pokemon who knows Rock Smash) on the shore near Olivine City. When you do, Krabbys (or rarely a Shuckle) may attack.

Pokémon found (Water)

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 * Corsola can only be found in the morning and daytime, while Staryu can only be found at night.

Items

 * Sharp Beak (from Monica on Monday)
 * Hyper Potion (hidden under the northernmost breakable Rock on the beach)

Follow the left edge of the fence and eventually, you will reach Cianwood City.



Islands
The four entrances to the islands, which cover most of the route, are all blocked by a whirlpool. HM 06 (whirlpool) which can be used to remove those whirlpools is found later in the game in Team Rocket's Hideout. It can be used outside battle after you have defeated Pryce and received the Glacier Badge (7th badge). The real reward of those islands is the legendary Pokémon Lugia. For further information see: Whirl Islands.

Pokémon found (Water)

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 * Corsola can only be found in the morning and daytime, while Staryu can only be found at night.