Heatran

Heatran (ヒードラン Heatran) is a /-type Legendary Pokémon in the Sinnoh region.

In Game
Heatran is one of the few legendary Pokémon to have a gender. It can be male or female. Although the female cannot have an egg, even with a Ditto. It lives at the top of Stark Mountain. You can encounter Heatran by going to the top of Stark Mountain with a trainer named Buck so that you can help him find the Magma Stone. Buck will then take the stone and leave Stark Mountain, causing the mountain to begin to act up. After you talk to Buck in his house, he will return to the mountain go put the stone back. Go back to the top of Stark Mountain and Heatran will be there in the place of the Magma Stone. Heatran is encountered at level 70 Pokémon Diamond and Pokémon Pearl. In Pokémon Platinum, for some reason, it is encountered at level 50.

Anime Appearances
It appeared in the movie Arceus and the Jewel of Life where it was being controlled by armor created by Marcus. It later turned on Marcus after it was released from Marcus' control after Dawn and several Pokemon, including her own, destroyed the armor.

Side Game Locations
Also: Pokémon Ranger: Guardian Signs= Event Mission

Pokémon Ranger: Shadows of Almia
Heatran appears as a boss in Pokémon Ranger: Shadows of Almia. During mission 11, "get the red gem", you encounter Heatran at the end of Boyle Volcano. You capture it, and it entrusts you with the red gem.

Trivia

 * Heatran is the only Legendary Pokémon that can be either a male or a female, where as Latias and Cresselia can be only female, and Latios can be only male. They are the only Legendary Pokémon that can retain a gender.