Houndoom is not considered a legendary pokemon because it is easy to get multiple houndooms. Legendaries are generally pokemon that can only be caught once in any given game (and are also difficult to catch as well as usually among the last pokemon in the pokedex for a region).
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Houndoom is exclusive to Pokemon Pearl so it must be traded.
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.
No. Houndoom is the final form of Houndour. It does not evolve.
Houndoom learns Flamethrower at lvl 48.
Houndoom can be found in the Peak zone.