Houndour can't be caught in firered so get one from emerald or colosseum.
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You get a houndour then evolve it i will update when I find out where to catch houndour
You can catch a Houndour in the Altering Cave in Pokemon FireRed.
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.
You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
In Platinum, Houndour is found on Route 214 and in Lake Valor.