You have to trade it from either Ruby, Sapphire, or Emerald.
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Breed a Loudred and hatch the Egg
you go get from pokemon, r, s and e or breed it from exploud or loudred
mt. coronet, peak 1, in the grass, need poke radar
1) train whismur to a good level 2) go on my pokemon 3) under whismur it will say evolve me 4) click evolve 5) you have evolved whismur into loudred
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.