Stark Mountain

Stark Mountain is a volcano located in the north of the Battle Zone in Sinnoh, at the end of Route 227. It is home to the Legendary Pokémon Heatran, which resides in the innermost chamber. Both Strength and Rock Smash are required to pass through the mountain's caverns. In Pokémon Diamond and Pearl and Pokémon Brilliant Diamond and Shining Pearl, the player's rival can be found in the entrance chamber, complaining about having been defeated by Buck. Within the main cavern, the player encounters Buck, who is hunting for the Magma Stone and decides to accompany the player to the entrance to Heatran's room. Inside, Buck takes the Magma Stone and leaves. In Pokémon Platinum, Charon takes control of Team Galactic and travels through Stark Mountain to take the Magma Stone and capture Heatran.