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It switched around a lot, but for a long while it was Onix.
Even as a kid I always liked bulky Pokemon. Onix had the highest Defense in the game (besides Cloyster but I never knew that), so it must be the bulkiest Pokemon, right? Brock would always go on about his "ROCK HARD DEFENSE" and his Onix was a pain to take down, I wanted one for myself. (I had no idea what Special/Sp. Def was back then.)
Plus, Brock's Onix was like the coolest thing in the anime.
