Houndoom is exclusive to Pokemon Pearl so it must be traded.
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Swarm. Route 230 in the grass.
in route 212 in pastoria city
Route 216 with the Poke Radar
you can catch dittos in Pokemon diamond and pearl with poke radar in route 218 but its pretty hard to catch them + find them. :)
you can catch snorunt on route 216 in the mountains (not mt. coronet).