ultramoon Pokemon UltraMoon ROM won't open in Pk3DS

[bobertdps4]

I've been want to make a Ultra Moon ROM hack where all battles are changed to double battles, but after extracting the files in packenglish and when I try to open it in Pk3DS nothing happens. I've used pK3DS with Pokemon X before and it worked just fine. When comparing my Ultra Moon files with my Pokemon X files and the UltraMoon files in a tutorial I noticed that the usual ExtractedBanner, ExtractedExeFS and ExtractedRomFS instead where called ExtractedManual, ExtractedN3DSUpdate and ExtractedO3DSUpdate. The contents of the files where also different. 

I don't think I did anything different and I'm pretty sure it's just a normal Ultra Moon ROM, so does anybody have any clue what might have happened and how this could be resolved?

[BlackShark]

That sounds like you didn't extract the right files. PK3DS can unpack and repack your ROM correctly. It just needs to be decrypted before.

[bobertdps4]

Thanks a lot! I managed to open the data in Pk3DS.

So if I want to insert the changes I made into the ROM I just rebuild either romFS or ExeFS depending on what I changed  and the change will be implemented into the game?