You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
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You can catch a Houndour in the Altering Cave in Pokemon FireRed.
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
In Platinum, Houndour is found on Route 214 and in Lake Valor.
You can find it in Pokemon Platinum, Pokemon Crystal, Pokemon HeartGold, and Pokemon SoulSilver.