To get to the central area in those games, you'll need to progress through the story. Here's a general outline:
1. Start in Pallet Town: You'll begin your journey in Pallet Town, where you choose your starter Pokemon.
2. Progress through Viridian Forest: You'll need to work your way through Viridian Forest, a beginner-friendly area that introduces you to wild Pokemon battles and catching.
3. Reach Pewter City: After Viridian Forest, you'll reach Pewter City, the first major city in the game.
4. Explore the Central Area: Pewter City is considered the "central area" of the Kanto region. You'll be able to explore the surrounding routes, including Route 4, Route 5, Route 24, and more.
Key Points:
* The central area is not a single location but a collection of routes and towns surrounding Pewter City.
* You'll unlock more of the central area as you progress through the story and defeat gym leaders.
* There are plenty of wild Pokemon to catch and trainers to battle in the central area.
I hope this helps! Let me know if you have any other questions about Pokemon FireRed or LeafGreen.