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The exact usage for PKHeX may vary slightly depending on which game you're editing, but much of the UI is the same across games. Loading Pokémon Data To edit Pokémon data in a save file, follow these steps. Use File -> Open Browse to the save you want to edit. You can either choose a save file or a Pokémon file. If you open a Pokémon file (*.pkm, *.pk7, *.pk6, etc.), the tabs on the right will immediately show the Pokémon data, and you can proceed to the next section after optionally making changes. If you chose to open a save file, you should now see your PC box to the right. You can use the drop-down or the ">>" or "<<" buttons to change boxes, or click the "Party-Battle Box" tab to see your party. Choose the Pokémon you want to edit, right-click it, and click "View". The tabs on the left should now show the Pokémon you chose. Saving your changes When you've finished editing your Pokémon to your liking, it's time to save those changes. You can do this either by saving the data to your save file, or by saving them to a Pokémon file. If you loaded a Pokémon file in the first section, "Loading Pokémon Data", saving a Pokémon file is your only option. To save your changes to the save file: Right-Click a slot on the right and click "Set". You do not have to choose the same slot you loaded from if you don't want to. This is actually a way to clone Pokémon if you so desire. When you're finished editing your save data, export the save file by using File -> Export SAV... -> Export main If you want to save just the Pokémon in the tabs on the left, click File -> Save PKM...

PKHeX is now able to edit parts of the save, known as save blocks. It allows users to export and import various save blocks. Here's a tutorial on how to get it done. Steps 0. Keep a safe backup of your unedited save, somewhere on your computer. We're not liable if this results in a corrupted save. 1. Make sure you redownloaded and use the latest PKHeX. (Initial version with this feature caused corruption. Additionally, older copies do not have the feature) 2. Load the target save in PKHeX. 3. Now, click on SAV on the tabs. 4. Now, click on the button Block Data 5. Another window should open up. 6. Scroll through the dropdown list at Block Key:. For this example, I'll be importing the file normal_encount into *Object KNormalEncount (Original quote below, can be found here) Since I'm importing into *Object KNormalEncount, that is what my screenshot shows. 7. Now that Block Key: is showing the correct value, select Import Current Block. 8. A window should pop-up. Select the correct file to import, then select Open. In my case, I'm importing the file normal_encount. 9. Now that the file has been imported, close only the first window 10. Then, proceed to File > Export SAV... > Export main 11. Now close PKHeX. If you want to make sure the new save file is not corrupted, reopen PKHeX and try to load the save. 12. You're done. Now reimport the save into your Switch to observe the effects. Note: As of v.1.2.0 of the game, they added a new file called normal_encount_rigel1, which I've been told is required for wild area events to work. For wild area events Index 24 and lesser, simply also import normal_encount into knormalencountrigel1. This means normal_encount is imported into two block IDs, being knormalencount and knormalencountrigel1.