IL runs must only have a certain amount of money specified in that levels ruleset and must be played for the first time and cannot be redone.

You must use Desmume if playing through emulation and have these settings:

frame skip off on zero

limit framerate to 60fps

Frame counter on

Input display on (You can use an external input display if you like)

Have FPS showing

Save states can be used on IL runs but not on Full game runs.