Here's why:
* Shiny Pokémon were introduced in Generation II (Gold/Silver). FireRed is a remake of the original Red/Blue games from Generation I, which did not have Shiny Pokémon.
* Game mechanics: The Shiny Pokémon feature relies on specific code and encounter mechanics that weren't present in the original Generation I games.
However, there are ways to get Shiny Pokémon in other Pokémon games:
* Playing Generation II or later games: You can find Shiny Pokémon in games like Gold/Silver, Ruby/Sapphire, Diamond/Pearl, and all the games that followed.
* Using cheats or mods: While this is not an official way to get Shiny Pokémon, some players use cheat codes or modifications to alter the game's code to increase the odds of encountering Shiny Pokémon. Be aware that these methods can be risky and may void your game's warranty.
So, if you want to find Shiny Pokémon, you'll need to play a game that supports the feature.