Citra, available for Windows, Mac and Linux, is the one for you if you want to play games Nintendo 3DS on your PC, without owning a console. You can download it here:
Citra | Download
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Unfortunately the emulator is only available for systems with architecture 64-bit. To see what type of system you have: Windows users, go to "Control Panel", "System" and read "system type". For Ubuntu users, instead, go to "settings", "system information".
At this point you will need a decrypted rom .3ds or .3dsx for the emulator imagery. We remind you that downloading ROM is illegal, therefore we cannot provide you with the link, but with a quick Google search you will certainly find what you are looking for 😉
Now open the file citra-qt. If at startup it gives you problems with the dlls, we refer you to this guide, or more directly to This Page. Then copy the missing .dlls to the Citra root folder. Now click on "File" and then "Load file".
Unfortunately the emulator is still in beta and goes very slow, regardless of the power of your PC.