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Can you take your pokemon from Crystal to use them in Colosseum, like the way you can take Ruby/Sapphire pokemon?

No.. no.. Sentret doesn't believe think so. The systems are completely overly very much different and cannot be switched around and thingies!! So it won't work really at all.
Oooh, ooh, another cool section. Look at Colosseum here !!! Isn't that kewl???