In the safari zone you go north and go to where there used to be the people blocking the way, they will be gone once you beat the league, go there and go in the grass and catch houndour with a safari ball, but they are rare to find so be patient
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You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
Houndour can't be caught in firered so get one from emerald or colosseum.
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.
Yes, it is in Safari Zone (After you get the National Dex) and in Altering Cave.
Houndour evolves at level 24 into Houndoom.