In Pokémon FireRed Version, Growlithe can be found on Routes 7 and 8. These routes are located on the east and west sides of Saffron City. Growlithe can also be found in the Pokémon Mansion on Cinnabar Island.
Poochyena, a dark Pokémon, evolves into Mightyena at level 18. Known as the "Bite Pokémon," it was introduced in the Generation Three series of games: Pokémon Ruby, Sapphire, Fire Red, Leaf Green and Emerald.