Perhaps you're thinking of:
* Mauville City: This is the main city in the Hoenn region, known for its large Ferris wheel and its Gym Leader, Wattson.
* Slateport City: This is the largest city in the Hoenn region, known for its bustling harbor and its Gym Leader, Winona.
It's possible you've misremembered the name or a detail about the city. If you can provide more information, I might be able to help you pinpoint the location you're thinking of!