Here's why:
* Lavender Town is in Pokemon Red and Blue. It's located in the Kanto region, and FireRed is a remake of those games.
* FireRed features the Johto region. Your journey starts in the Johto region, with a separate map from Kanto.
If you want to experience Lavender Town, you'll need to play either Pokemon Red or Blue.
However, you can access a location similar to Lavender Town in FireRed:
* The Pokemon Tower is located in Ecruteak City (Johto region). It is a tall, dark tower that serves as a graveyard for Pokemon. It's not the exact same as Lavender Town, but it has a similar creepy atmosphere.
Let me know if you have any other Pokemon questions!