Tyrogue
Go to the city with the fourth gym and go to the second cave.(Make sure you have an empty space in your party)Turn to the right in the cave and surf.
Go up the water fall to the top and enter the cave next to you.(Do not move any bolders or you will go the wrong way+You will surf a lot)Find your way through the maze you will eventually find a karaty guy battle him and if you beet him he will give you Tyrogue as proof you beet him.
More tricks, tips and cheats for this game are right here - Pokemon Silver cheats
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