You can catch a Houndour in the Altering Cave in Pokemon FireRed.
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You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
Trade Colloseum or evolve Houndour (to get by trading Houndoom from Colloseum and breeding).
You get a houndour then evolve it i will update when I find out where to catch houndour
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.
Since you can't catch houndour your going to have to trade the Pokemon colosseum houndoom to firered breed it then hatch the egg to get houndour or you can get one from emerald's safari zone.