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Anonymous
Train it up to level 40. It is a high level but there's a hint for training Pokemon in my answer to this question: How do you get EXP all in Pokemon Sapphire
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Rhyhorn evolves into Rhydon at level 42 in Pokemon Emerald Version.
Rhyhorn evolves at level 42
42
safari zone
You can catch a rhyhorn at the safari zone west of lilycove