Hahaha exactly. And he has been scheeming around for millions of years, grooming many OP legendary characters. His past actions are pretty much trolling future generation genius young masters even before they were born.
I'm not 100% sure if I understand what you're requesting, but... pretty much any JP isekai story fits that? Protagonist is OP but wants to be lowkey, so he finds ways to train his allies, get them good equipment, let them accomplish great deeds, etc. Usually they're his slaves or his waifus, but if there are men on his side he'll guide them to greatness too. And all of them will end up OP. Probably the defining story of that style is Utawarerumono, though it's not a novel (game and anime). They (the allies he finds) all have potential, but the protagonist finds the right uses for their talents and helps them find a direction to grow into. Spoiler: Especially considering that the protagonist is a god and the last boss, so they'd better become OP by the time they face him...
Emperor's Domination is the kind i was looking for.. (setting aside LQY's "Grand Quest" of searching the Truth of something i still wasn't clear about.) I mean, LQY trains all those people he likes(i guess?). Okay, i mean sure, he's a fuckin old monster.. And i can see that a lot of people discussing this particular novel about mc being the only cultivator in the modern world .. so i think it's worth the shot i guess..
So does another story... Random frickin stranger: "You sure m8?" MC: "Because I'm Batman." Stranger: "Uh, sure. But, like, no other reason though?" MC: "Because I'm Batman." Stranger be like : "k bruh"