Have you tried the latest melonDS version? I think you'll now be able to play games with it.Thanks for the reply. I tried melonDS previously but unfortunately wasn't able to get it to work with the DS ROMs I had dumped from my Wii U.
I've got no access to a Wii U sadly, but how did you got the ROM dumps? Did you tried following this guide? https://lendunistus.github.io/wiiuvcextract-guide/Yeah, I only just tried it recently, last week, I believe. The creator of melonDS told me it doesn't work because VC ROMs are encrypted.