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Actually yes; block 4 is the tail end of the game progress block. You can try zeroing that block out and re-exporting with PKHeX.

It works on the latest Switch version of the application, which is 3.2.1: https://www.nintendo.com/en-gb/Support/Nintendo-Switch/Game-Updates/How-to-Update-Pokemon-HOME-1743722.html The plugin does not work with the mobile app.

Block 4 is the first box & half of box 2. Every other block is present, so everything about game progress is there. I uploaded a fixed save for you

This tutorial will show how to replace textures in a .BMD0 file (Vs. Scenes, Fly sprites, etc.) First off, download the following programs: NitroExplorer2 Tinke (latest version) Mario Kart DS Editor Some kind of image editing software For this tutorial, I will be replacing Vs. Scenes. Step 1. Open NitroExplorer2 and navigate to a/1/6/6, extract the NARC. Step 2. Open the NARC with Tinke. Step 3. Find the file that you want to edit, the Vs. Scenes are usually start around the 80th file. Step 4. View the file and extract it (be sure when extracting the file you put .nsbmd at the end of what ever you named it). Step 5. Open Mario Kart DS Editor. Step 6. Goto Tools>Nitro Explorer>NSBMD ==> NSBMD + NSBTX Step 7. Select the file you extracted, and save the new .nsbmd, and the .nsbtx Step 8. You should now have a .nsbtx file, Open it in Mario Kart DS Editor. Step 9. Textures should appear, the top part contains the images, and the bottom part contains the palettes for the images. Step 10. Select the palette, then the image, and extract it as .png Step 11. Edit it however you like, color limit doesn't matter. Step 12. Save the image, then go back to Mario Kart DS Editor and replace the image. Step 13. Save the .nsbtx, and goto Tools>Nitro Explorer> NSBMD + NSBTX ==> NSBMD. Step 14. Rename the new NSBMD file to (name).BMD0 Step 15. Replace a Vs. Scene with the one you just edited. Step 16. Pack the NARC and re-insert it. Your .BMD0 should be working properly. If you have any questions, or comments, let me know .

Sadly no, that didn't seem to help. I've tried both dumps created by hactool on PC and by nxdumptool.nro directly from the switch, and both come up with the error. Same file structure/size/file counts each time. Guess I'm just waiting until either the program gets more progress made on future builds to work more accurately and easily, or trying to find someone else's working romfs to borrow.