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As part of my team I always like to have a Rock Pokémon. Before now I've always gone with Geodude, but I was thinking of switching for Onix for SoulSi

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Geodude or Onix? - Pokémon HeartGold/SoulSilver - Giant Bomb

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Geodude or Onix? - Pokémon HeartGold/SoulSilver - Giant Bomb

What is a good 6th Pokemon for my team in HeartGold? I have