>>43174689Onix was designed to be "First Boss" material. To be "Brock's Pokemon". High defense, low attack, obscenely weak to 2/3 of the starters. They literally weren't expecting Pokemon to become as big as it did when they were first coming up with these things.
They tried to rectify it with Steelix (and later Mega Steelix), but no matter how much you polish a turd, it's still a turd.