The only way it is obtainable is through catching a Houndour, which is uncommon and only available at night in Route 7 (http://bulbapedia.bulbagarden.net/wiki/Route_7) in Kanto. Then training and evolving it
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Espeon, Feraligatr, Houndoom, Lapras, Ampharos, Crobat is my favorite team and i think you should just play with your favorites. But if you are looking for really good Pokemon with the best stats you should probably exchange your Houndoom for Arcanine and Lapras for Poliwrath.
Houndoom is exclusive to Pokemon Pearl so it must be traded.
You can get Houndoom in Pokemon Platinum by evolving Houndour. Houndour can be found on Route 214 and Valor Lakefront! Houndour will evolve into Houndoom at level 24.
No. Houndoom is the final form of Houndour. It does not evolve.
Houndoom learns Flamethrower at lvl 48.