Is There a Gamecube Emulator?

If so just say what it is

Yes.Dolphin Emulator is a Gamecube (and early Wii) emulator
http://www.dolphin-emu.com/news.php

That works on computer?

Yes. I did give you the website, you could have looked at it :)

Thanks now i can play like my fav game Pokemon XD Gale of Darkness!
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Btw how do i download it i go to the site and go to downloads so what do i do?

I'm assuming you are using a 32bit Operating system (majority of people are).Click on [Unofficial] Windows Builds 32bit
And download the latest build, which is Dolphin SVN Build 3972

Ok!
Thanks again!
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Once again i pleed for help.
which of the 4 do i download?

The latest one will be your best bet.
Dolphin SVN Build 3972

Thanks again!
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um when i click download it says "Download Requested" is that supposed to happen?

Yes, it will say in small letters under it:Download queued, will begin in 15 seconds.Then:File was successfully queued and is now ready for download.Click on the underlined download link

ok
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im not seeing small letters
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never mind i missed the letters

I tried dolphin, it was terribly laggy.

Replying to #12

The emulator is far from perfect, but it is the best one available. And obviously the better system you have the better your results will be.

Try searching for Help here...www.thepurplecube.org
Sometimes the older version of dolphin works well on certain GC games. ;D

hm then which one would work best for Pokemon Gale of Darkness?
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i got another problem when i click extract here on pokemon xd gale of darkness it just makes a copy of itself and i mean the unplayable copy
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and when i play another game called pokemon box on it it doesnt work