Stark Mountain is a huge volcanic mountain, and is home to a lot of Fire-types, including the
legendary Heatran. The mountain is a great training place and is full of double battles. The
mountain consists of three rooms, the opening room, (no trainers, except for team galactic on
first visit on platinum) the huge body room (full of trainers, mostly double battles) and
Heatran's room (just team galactic again, on platinum). After your first visit,
return to the Survival Area and talk to Buck. After that, head back to Heatran's room and catch this Fire and Steel
type Pokémon. Mars and Jupiter are last seen here.