Why didn't Nintendo make this game for the DS it could be something that alot of people want to buy
My guess is that it would take a lot of resources and time to make it, and they gave priority to original games like NSMB, or remakes of older (I don't think Luigi's Mansion was released all that far before the DS.).
how are you going to do this
cuz in the real GC system they use alot of stuff
I heard that the game was around 2 maybe 3 gig and that is alot
The size of a final ROM/ISO doesn't necessarily say whether a port to another platform will be possible or not. I think the size of the assets would just be a fraction of that, and from there, you could compress the images, and reduce the number of polygons in the models.
Super Mario Sunshine 64 DS
is a prime example of this that shows that it is indeed possible (Albeit very, very challenging.).
is there comming a version that you only use the Important assets for on the DS because I also want to trick my friend into this ;P Keep on going with your great work
I'm not sure what you're saying here.