sorry but you cant, houndoom is on the 2nd generation Pokemon and above, so that means he is not on fire red and leafgreen because they only have the 151 Pokemon on them from the original game.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
You can catch a Ho-Oh at Navel Rock in Pokemon FireRed.
You can catch Moltres at Mt. Ember Peak in FireRed.
you can not catch him
You cannot get it in Pokemon FireRed. It doesn't matter because it is not necessary in Pokemon FireRed.
you can't catch any hoenn Pokemon in firered or leafgreen you must trade hoenn Pokemon from ruby or sapphire or emerald to leafgreen or firered.
You cannot catch it on Pokemon firered only on diamond pearl and thhe new one Pokemon platinum
You can't get mew in firered or leafgreen.
Growlithe is found in the Pokemon Mansion on Cinnabar Island in Pokemon Firered.
Catch all the Pokemon!
Agumon is not a Pokemon.
Catch, trade, and battle Pokemon