Hello all, I just read a forum post by @YoshiOG1 about a homebrew version of PKHex.
Just so you know YoshiOG1, there is a current WIP called PCHex which is slowly bringing the functionality of PKHex to the 3DS as a homebrew.
https://github.com/Strackeror/PCHex
Currently, you can change IV's, EV's, PKRS Strain and Level. He is currently working on adding species (change of actual Pokémon).
Enjoy!