That's a kinda hard thing to find, most RPGS have level systems, which require grinding a bit, The ones with less grinding thatn most i've seen, are Tales of Berseria, and God eater 3, i'd make an argument for FFXV with how easy it is to abuse the xp system, like at some point of the story you can jump to lvl 99 in mere hours.
I am also not quite so sure what you mean with rpgs, but i enjoyed the ori games a lot.
They progress very quickly and while you have the ability to grind for 100% unlocks in everything the game is super fun without it.
like others have said, I'd say FF14 is the least "grindy" I could think of, but it depends on what kind of grind you are wanting to avoid, because all games are going to have a grind of some kind or another.