I'm not saying all Pokemon need to be great at end-game, but Ledian isn't even good its niche at earlygame. It evolves at level 18, eight levels after Butterfree and Beedrill. It learns the screens people praise it for at LEVEL FUCKING 24.
At that time in GSC, you're at Whitney or Morty both of which can either one-shot your physically frail bug or doesn't care about
screens.It's worthless.
Not everyone Pokemon needs to be good at endgame, but every Pokemon should have at least something they're alright at.
Even early on in its original game, Ledian is a shit attacker, a shit supporter, a shit tank, a shit wall, a shit Utility Pokemon.
You are actively holding yourself back if you use this Pokemon at all outside of gettting the dex entry and I can't really say that about many other Pokemon at all. Maybe Delibird but at least Delibird got Hustle and some decent support moves like Tailwind in later generations.