Go to Ecruteak City and then defeat all 5 Kimono Girls. Talk to the man with the blue hair and the hat.
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In Pokemon Crystal you can get the HM for Surf in Ecruteak City. The HM for Surf is a reward from an Old Man for defeating the Kimono Girls. The Kimono Girls can be found in the large building next to the pool of water.
You can not obtain a Crystal Onix in the Pokemon games. It is only featured in the TV show Pokemon
The only way to obtain a Kabuto in Pokemon Crystal is to trade one over from Red, Yellow, or Blue.
Surf to the right until you find an island he should be there
Simply go to pallet town and surf south