Go directly from power-on to Nintendont (or Melee-focused variants) by autobooting through this forwarder.
Download from the releases page.
You can't autoboot Nintendont from Priiloader out of the box, unfortunately.
So slap these forwarders in your apps/
folder and set Priiloader to autoboot them instead.
It forwards to (CASE SENSITIVE):
apps/Nintendont/boot.dol
apps/Nintendont Slippi/boot.dol
apps/NintendontForMelee/boot.dol
which should be where you installed Nintendont and variants.
If you do it right your SD card should have this folder structure:
SD
apps
Nintendont
boot.dol
icon.png
meta.xml
Nintendont Forwarder
boot.dol
meta.xml
Nintendont Slippi
boot.dol
icon.png
meta.xml
Nintendont Slippi Forwarder
boot.dol
meta.xml
NintendontForMelee
boot.dol
icon.png
meta.xml
NintendontForMelee Forwarder
boot.dol
meta.xml
I grabbed the source from a post by FIX94 on GBAtemp. Looks like this code was even handed down a number of times before that.
You can autoboot Nintendont and any variant by using the correct settings in Priiloader. HOWEVER, you will have to re-'install' every time you update your Nintendont. Since this is somewhat error-prone, I don't recommend this method. If you use the forwarder you'll never have to think about it again.
Use System Menu IOS: off
IOS to use for SM: 58