Elite Trainer Mark on X: Onix was Brock's first ever Pokémon. However, it didn't even evolve under his ownership, it evolved into Steelix while his brother Forrest was taking care of it.
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Brock's Steelix, Pokémon Wiki
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Elite Trainer Mark on X: Brock's starter Pokémon was an Onix that was given to him on his 10th birthday by his father, Flint. I'm not sure what other Pokémon Flint would have given his son considering they lived at a Rock-type Gym, so I guess Onix was pretty
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