DeSmuME is a Nintendo DS emulator
http://desmume.org/ and find a rom yourself because I legally can't share the link to one here but just google "HGSS ROM" wowroms should be safe
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
SimCity Creator Emulator Mac?
1 project | reddit.com/r/SimCity | 27 Jun 2022
I forgot how annoying it is to grind for levels
1 project | reddit.com/r/nuzlocke | 13 Jun 2022
Desmume a malware?
2 projects | reddit.com/r/Roms | 24 May 2022
DeSmuME v0.9.13 released!
1 project | reddit.com/r/emulation | 23 May 2022
1 project | reddit.com/r/Roms | 4 May 2022