What legends can you catch in firered?

In Pokémon FireRed, you can catch several legendary Pokémon, including Mewtwo, who resides in Cerulean Cave, and the three Legendary Birds: Articuno, Zapdos, and Moltres, found at their respective locations—Articuno in the Seafoam Islands, Zapdos at the Power Plant, and Moltres on Victory Road. Additionally, you can also encounter the Legendary Beasts, Raikou, Entei, and Suicune, but their appearances depend on your starter Pokémon choice. Other than these, FireRed does not feature any other legendary Pokémon from later generations.