To catch pokemon you can never catch on Ruby version or Sapphire Version you need the bonus disc for Pokemon Colloseum for GameCube. When you do this you will be able to transfer that pokemon to your version. This time you can catch Suicune, Entei, Raikou, Articuno, Zapdos, Moltres, and more pokemon that can only be caught on Red, Blue,Yellow, Gold, Silver and, Crystal versions. It will be easier to catch Deoxys & Jirachi.