@kirbyderg ooh yeah. I remember bulbasaur having a huge weakness to Leech Life, and parasect had a x4 weakness to poison, flying, fire, and maybe ice? but forgot poison was weak to bug, which would be x4 weakness to bulbasaur as well

there's surprisingly few typed attacks to worry about in gen1, I think. like most common pokémon just don't learn STAB attacks stronger than Ember at the levels you fight them, outside of flying/poison/normal? you're just not getting hit with flamethrower, surf, thunder, psychic, etc. very often (drill peck, wing attack, hyper fang; psibeam at higher levels?) (Lance's gyarados might have known Hydro Pump, & I feel like Lorelei had access to Ice Beam/Punch?)

I think the only trainer I remember as "dangerous" is the second-to-last trainer in mt. moon's first area, with the Zubat that knows Supersonic (possible to get v unlucky, especially if you're relying on only 1-2 pokémon, which I usually was at that point), Misty if you started w/ charmander, & after that just being ridiculously overleveled (since I wasn't leveling anyone outside of my core team) -- oh right, and then Zapdos was a nasty shock.

@kirbyderg trying to remember if *any* npc has a strong electric move in gen 1 — Surge's Raichu knows Thunderbolt, I don't think you encounter anything that knows Thunder… maybe rival's Jolteon? no electrabuzz in blue

oh, bruno's hitmonchan should have Thunder Punch

other than that I think it's literally just Magnemite's Thundershock & that's probably less threatening than Sonic Boom, given Gyarados's (& water types in general) good special stat

@kirbyderg I always bought the magicarp, and by religiously leaving it in the first slot & swapping to a different mon to split the xp, iirc it would evolve just before getting to Vermillion City, after Cerulean.

you don't necessarily want to be giving every goddamn zubat a free hit on bulbasaur, tho.

@kirbyderg ah yes, the  Leech Seed ->  Harden fight…

at least Poison Sting's status effect still works, but ye it's rough!