The Retro Challenge: Level-Up Moves Only in the old-School Pokémon Era

I've been trying out a "Level-Up Move Only" challenge, but I think it only works in retro games like the Pokémon Red and Pokémon Green betas (the ones that were only released in Japan; Aka and Midori, respectively) or even on Discord bots like Pokétwo.
I see that the pacing doesn't work in modern games like Pokémon Shield, but in old-school emulated runs, it's a tough test of strategy.
Have you ever tried a challenge that worked perfectly for one generation but seemed impossible for another?
I'm excited to hear how you modify your strategies to fit different imposed rules on different eras of gaming!🐺🎮