And isn't there a DS emulator for Linux/Mac OS X?
Yes, but for Linux compatibility, I think the easiest way would probably be to run a cracked version of MacOS on a virtual machine.
With this, you can easily emulate an iPhone on the VM to use Dolphin to emulate a Wii program like DeSmuMe!
Once you get DeSmuMe working, you should be able to seamlessly get the DS version of this game loaded up in no time!
Hope this helps :)
ps: please do not try this, this is purposefully convoluted and terrible advice
It's not actually that difficult, and even works on non-jailbroken devices (although jailbreaking makes it considerably easier.)
The download and full instructions can be found at https://dolphinios.oatmealdome.me/