You can catch a Whismur in a lot of places:
Route 6, Route 9,
Route 10, Route 13
Route 21, Route 22, Route 24, Route 25, Route 26, Route 27, Route 28,
Route 30, Route 32, Route 35,
Route 42, Route 43, Route 44, Route 45, Route 47,
Ruins of Alph, Mt. Silver
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You can't find a Whismer walking around.
You can't catch whismur in Pokemon pearl or diamond but but you can catch its evolved form loudred with the pokeradar on the top of mt coronet.
Catch a whismur and evolve it twice, once into loudred and again into exploud.
You can catch Lombre in Pokemon HeartGold in the Safari Zone at a waterside area once you receive the National Pokedex.
Find and then catch