How can you get a whismur in Pokemon XD?

You can't get a Whismur in Pokémon XD: Gale of Darkness. Whismur, Loudred, and Exploud are all exclusive to the Pokémon Ruby, Sapphire, and Emerald games.

There are a few ways to get them into your game, but they all involve trading from another game:

* Trading: You can trade a Whismur from a Ruby, Sapphire, or Emerald game to your copy of Pokémon XD.

* Wireless Adapter: If you have a Game Boy Advance and a wireless adapter, you can connect to other players and trade Pokémon, including Whismur.

Unfortunately, there's no way to find or catch a Whismur in Pokémon XD itself.