You can't. Pokémon Colosseum is a separate game designed for the Nintendo GameCube System.
You can't get jirachi in ruby unless you receive it from the Pokemon colosseum bonus disc.
You can't find miltank anywhere on ruby only colosseum can get miltank.
you have to trade him from Pokemon ruby or emerald.
If you pre ordered Pokemon colosseum you got a bonus disc that you could get jarachi and put it on ruby/sapphire
sure can
No but you can get Lugia in Pokemon Xd just trade it to a GBA Pokemon version like Ruby then trade it to colosseum.
You would have to trade a groudon from ruby or emerald to colosseum to have one.
No you cant catch Latios in Pokemon Colosseum. You can only trade it in from your Ruby or Sapphire game in to the Colosseum game and that's the only way you can get it.
Latios can be traded to Colosseum from Ruby, or Emerald.
You cannot catch/see 'Entei' in Pokemon Ruby. The only way to get it to Ruby is to trade it from Leaf Greean, Fire Red or Colosseum.
You have to trade from Pokemon XD or Ruby, Sapphire, Emerald, Leafgreen, or Firered.
You can trade with another sapphire, ruby, emerald, firered, leafgreen, Pokemon colosseum, Pokemon xd gale of darkness and Pokemon box ruby and sapphire.