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For me, it's Geodude.
It is found early, at two separate locations before the first gym (Route 46 and Dark Cave). Beats Falkner as soon as it learns Rock Throw, beats Bugsy without even trying, is your safest bet against Whitney's universally terrifying Miltank bar the trade Machop, beats loads and loads of neutral trainers through typing alone, including the majority of Team Rocket, and never ceases to be useful. If you chose Chikorita, have fun watching Geodude roll all over Silver's team, and once you get to Red, you only need to think about half of his team. The rest is already covered by this trusty rock.
