>>54121558Let me be honest, I've been playing Crystal (because I've been replaying every Pokémon game again, taking it slowly and on physical hardware so I'm forced to never speed up) and I think G/S/C are fine the way they are. At most, I'd increase the availability of Johto mons and reduce the availability of Kanto mons, along with maybe adding a few Johto mons to some of the gym teams.
Without grinding even a little bit, I finished the 6th gym with level 25 mons and only Johto Pokémon and it's not a huge struggle but I'm not overleveled either and there have been a few close moments (hell I'm WAY below the level cap). I think Johto mons are actually not as bad as people say when it comes to quality of movesets (at least some of them).
Hoothoot/Noctowl gets Hypnosis, Hopplip/Skiploom gets powder moves and leech seed for a pretty good annoying mon that wears down the opponent, Quagsire is pretty nice thanks to Surf and Amnesia, Dunsparce is surprisingly strong against a lot of trainers, etc. In G/S you have Ampharos too which is really reaally good.
I think Nuzlockes just kinda ruined my perception of this gen, when right now I'm having a really fun time thanks to the movesets these Pokémon have. I was expecting to hate the game but I'm loving it.