Game Emulation for Screenshotting/Sprite Capturing Purposes

[Firejoker54]

You're going to waste your time re-ripping sprites. There is no correct/official NES palette. Of course it varies between emulators but your rip won't be the "right one" either.
In any case, this site may help you:
https://gamehacking.org/system/nes
I'd suggest actually getting good at games though. There's not a cheat code for everything