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A few people have already mentioned Brock if you didn't pick Charmander, but he's arguably even easier in the Johto games, especially Gen 2.
>Entire team is 4x weak to Grass, 3 of them are 4x weak to Water as well
>Levels on par with the second Elite Four member
>3 NFEs on a post-Champion boss (I'll give him Onix because Steelix isn't a Rock-type, but really, Graveler?)
>Most of his team have 2 decent attacks at best
Considering you need Surf to reach this point of the game and you can buy ThunderPunch/Ice Punch TMs for barely anything in Goldenrod, I can't see how any remotely competent team could struggle against him. He's a little harder in HGSS because his entire team gets bumped up 10 levels, but he still hasn't evolved any of them, not to mention he's using an illegal Sturdy Rhyhorn.