I have learned that if I import a Japanese Ruby, it will play on my N. Am. DS. So, the next question is: will a Japanese Colosseum run on my N. Am. Wii? I am wondering because this is the only way for me to get a legit Celebi.
Only American Wii games can work on an American Wii, since it is region locked.
There is, however, a way for your Wii to get 'modded' apparently, so you can check the source to see a few links.
Hope I helped. :)
Source: Yahoo! Answers