Go to Mount Mortar and go through the middle cave. Then just keep following the paths.
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The Karate King can be found in Mt.Mortar in Pokemon Gold. You will need the HM moves Surf and Waterfall to reach the part of the cave where the Karate King is training.
The Karate King! You can get a Tyrongue if you defeat him.
In Pokemon Gold, Silver, Crystal, Heartgold, and Soulsilver the Karate King is in Mt. Mortar, East of Ekruteak City. He will have a Hitmonlee and Hitmonchan, and give a Tyrogue upon defeat if you accept it and have a space empty.
He is the Gym Leader in Cinawood.
Mt. Mortar