After Fuchsia City in Pokemon FireRed, players typically head south to Route 19, then surf east to reach the Seafoam Islands. From there, they can navigate through the islands to eventually reach Cinnabar Island, where the next gym is located. It is important to have surf and strength HMs to progress through this route effectively.
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The answer depends on if you took on Fuschia after Saffron or before.
If before: Head to Saffron City, to get access to the gym you will need to defeat all the Rockets, your Rival and Giovanni at Silph Co (the massive building in the centre of town). Once that is complete you can challenge Sabrina in her gym.
If after: If I remember correctly you will need to Surf via Pallet Town to get to the next Gym in Cinnabar.
YOU FIND IT IN FUSCHIA CITY NEXT TO THE WARDEN'S HOUSE
In Area 3 of the safari zone in fuschia city.
go to fuschia city
you need to get the badge in fuschia city
You can catch it at the Safari Zone in Fuschia City but it is rare. Throw rocks at it and make sure it doesn't flee so you can catch it easier.