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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

Geodude, Pokémon Wiki

Geodude (Pokémon) - Bulbapedia, the community-driven Pokémon

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