I think you have to use an SD card. As the Stage Builder doesn't recognize USBs

That's the moveset & the animations.

I'd gladly host a PAL Backup, but my Disk won't rip.

I've recently made an import of the Ghostly Galaxy Bouldergiest arena over Final Destination. However, I've no clue how to import a new sky model for a Final Destination based stage. Can someone give me pointers? Or have I picked the worst stage possible?

Right click on the Model file you're importing to, near the bottom of the dropdown menu is "Import New Object"

I attempted this. Sadly to no avail. The only result I got when trying to import Ike's sword onto a Knuckles model? The sword showed up fine. But the Sphere (for when Sonic Based Models jump) was constantly present & the move on the PSA I use where Knuckles throws a boulder resulted in the Boulder being stuck to Knuckles' hands visually. Shame too. I was really hoping this'd work for what I wanted to use it for.

Replacing them in sc_selmap would replace them on the top left, with the little thumbnails showing who's playing as who. As for the in battle ones. Are they in an info_en.pac file?

How odd. I haven't had a problem like this. Though Brawl Box doesn't like edited Sonic Colors files, but that's a whole different story.

Ah good. Something for me to look into then.

I'm wondering if it's possible for me to replace Ness with a PSA that is designed for Marth. I'm aware of rel porting, though I'm not sure how to accomplish it & whether PSAs that were designed for the character being ported will work.

If you have BrawlBox you could open the .pac & save it as a .pcs

I tried that. No luck unfortunately.

For some reason that's causing Brawl to crash on start-up... 

Is there a .pcs file in there? .pac files are for things like SSE.

I've recently switched from using a PAL Disk of Brawl to an NTSC ISO. I've used a code to unlock everything, & while it worked. There's a slight problem. Music. The Challenges list all the CDs as collected. But they still appear in matches & the Sound Test hasn't being affected. Any code I could use to correct this? Or will I have to CD farm?