I really want a Shadow Smeargle in Pokémon Colosseum, but I can't find the trainer (Biden) who has it. I know it's an old game, but I just need help. For once, the internet hasn't helped me a bit...
You find it along with the shadow Ursaring in Snagem Hideout.
Hope I helped!
Click "Finding Smeargle and Ursaring" at the top of the page.