Replace the romfs folder of your original game with the one provided in the Neo X archive. :
To convert your legal Pokémon X ROM into Pokémon Neo X , you will need a few tools. This process works on a PC, Mac, or even an Android phone. pokemon neo x 3ds rom top download
Do not use a save file from a vanilla Pokémon X in Neo X. The wild encounter tables and gym leader data will corrupt the save. Always start a New Game . Replace the romfs folder of your original game