Heatran is a FireSteel-typeMythicalPokémon from Generation IV. It is also known as the 'Lava Dome Pokémon'.
How to Obtain
Heatran can be obtained once you talk to Professor Oak in Saffron City and meet his requirements. His requirements are 300 Pokédex entries and a space in your party. Once you meet his requirements, Professor Oak will give you a Heatran (possibly shiny.) If you don't get a shiny just leave the game and rejoin until you get a shiny. You can also do this to Lugia, Ho-Oh, Meloetta, Pachirisu and Regigigas.