Oh. From what I search, you need CFW to make it work and I'm not sure if you could do that on Citra.I already have a means to get the “system” file off of the 3ds and I know where said data should be kept in Citra.
What I don’t know is how to convert the MHGen data to MHX on Citra and then transfer the MHX data to MHXX on Citra.
If you want, download the .cia on to Citra and then load it.
Get the compiled version.
https://gbatemp.net/threads/release-mhx-data-manager.434848/
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Be sure to backup save files and also, try experimenting it