I don’t know if you mean this list but as far as I understand they should just either run directly in 240p, or there is a menu option.
Edit: regarding megaman x collection, later in the thread:
”The games run in their native resolution but the videos for X3-X6 run in 480i for some reason. One thing to note is every time you get a game over or beat a level you are taken to the memory card save menu which is in 480i. ”
It’s also possible it depends on which region the game is.