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I have a feeling Onix was originally designed as an early game mini boss Pokemon. Think about it for a second.
>Easily the longest 1st gen pokemon
>Relatively humongous defense made it difficult for a lot of early game pokemon to break
>Rock/Ground typing made it resist Normal, Flying and Poison attacks as well as an Electric immunity. Pokemon found before Brock's gym are largely Normal, Flying or Poison. It coincidentally is immune to Pikachu's STAB.
>Rock attacks means it can do large damage to Flying and Bug pokemon. Ground attacks means it can hit Poison pokemon. Again, what types of pokemon are found before Brock?
>It's extremely weak and ineffective from midgame on. Seriously, every other Rock/Ground type evolves and eclipses it by large amounts.