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Appendix:Pokémon Colosseum walkthrough/Shadow Pokémon List
From Bulbapedia, the community-driven Pokémon encyclopedia.
Having preordered a copy of Pokémon Colosseum, you can bring Jirachi into Ruby or Sapphire (FireRed, LeafGreen, and Emerald are ineligible) as long as you have a Game Boy Advance/GameCube connectivity link cable.