Here's why:
* Dragonair is a rare Pokemon: Even in the wild, it's not easy to find. It's a later evolution of Dratini, which itself is relatively rare.
* Safari Zone has specific Pokemon: The Safari Zone in FireRed has a limited pool of Pokemon available to catch, and Dragonair is not included.
To find Dragonair in FireRed, you'll need to:
1. Evolve a Dratini: You can find Dratini in the wild in various locations, like in the Seafoam Islands or sometimes in the Kanto region.
2. Level up your Dratini: Dratini evolves into Dragonair at level 30.
Important Note: If you're playing Pokemon FireRed, you can use the "Old Sea Map" item to get to the Sevii Islands after completing the main game. You'll find Dratini and other rare Pokemon there.