To obtain a Tyranitar, you can start with a Larvitar , its pre-evolutionary form. Larvitar can be found in various locations throughout the Pokémon games, such as Mt. Silver in Pokémon HeartGold and SoulSilver or in the Safari Zone in Pokémon Ruby , Sapphire, and Emerald. Train it, level it up, and it will eventually evolve into Tyranitar.