The port town of Olivine City has a couple of interesting attractions—the Lighthouse and the port for the highspeed watercraft, the S.S. Aqua. There's a problem at the Lighthouse that you need to attend to before you can even attempt to battle the city's Gym Leader.
The Olivine City Gym Leader
When you arrive in Olivine, you'll find your rival lurking near the Gym, but he isn't interested in you. He's looking for Jasmine, the Olivine Gym Leader. The word around town is that she's gone to the Lighthouse to help a sick Pokémon. If you want to win Olivine City's Gym Badge, you'll have to head over to there. The Lighthouse is full of Trainers trying to prove their worth, so be prepared for quite a few battles.
Get the Good Rod
Another generous fisherman, found in the small house next to the Mart, will give you the Good Rod here, so now you can finally catch some decent Water Pokémon. In fact, there are a bunch of good things to fish for right here in Olivine City, and its small harbor.
Pick up HM 04 (Strength)
The Sailor in the house next to the Poké Center gives you a new Hidden Machine. Teach HM 04 to a Pokémon and not only will it learn a powerful Normal attack, it will also be able to push aside the rounded stones that you see in dungeons. Once you get HM 02 (Fly), you'll be ready to do some backtracking
Swap a Krabby for a Voltorb
This isn't a particularly exciting trade, since you'll have opportunities to catch wild Voltorb, but you might as well go for it. After all, you can just step outside this guy's front door and fish up an extra Krabby right here and now.
|Old Rod||Good Rod||Super Rod|
*Corsola can only be found in the morning and daytime, while Staryu can only be found at night.
|#222 Corsola||#120 Staryu|
|Corsola is the token Water/Rock Pokémon. It's not an effective combination, and Corsola doesn't have much to show for it; just a bunch of primarily defensive skills and fairly bad stats.||Staryu are nocturnal now, but it's worth setting up a nighttime fishing trip to catch one. Staryu and Starmie have solid stats, learn new moves like Rapid Spin (at level 13), and get old moves like Recover much earlier. Stick with Staryu until level 50 before you evolve it, since Starmie can't learn Hydro Pump.|
|#170 Chinchou||#90 Shellder|
|Shellder's evolved form, Cloyster, was a favorite of some RBY players, but now that Special has been split into two stats, you may find its low Special Defense a problem. To make up for it, it learns Ice attack Aurora Beam at level 17.|
|Magnemite, Voltorb is still pure Electric. This is good, because it means it gets to keep its incredible Speed. Use a TM to teach Thunder to its evolved form, Electrode, and you'll have a first turn K.O.'ing machine.|