Hi I was just wondering if doing runs of X5 on the legacy collection version is valid cause that's the only one I have besides using emulators which I would assume have restrictions against them to prevent cheating.

Yes, legacy collection is perfectly fine since the leaderboard is sorted by in game time, though it'll be less consistent since you can't do the enigma manip. You can read about emulator rules here: https://megamanleaderboards.net/index.php?page=emus And I'd also suggest submitting your runs on this board at mmlb before submitting here: https://megamanleaderboards.net/index.php?game=16