The same place you find him in gold, north of Goldenrod City. You have to beat Whitney and then get the Squirtbottle from the house behind the gym. Use it on Sudowoodo and he will attack you.
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if you know the sudowoodo blocking the way u have to battle it and catch it
you don't
Sudowoodo is not the only Pokemon that can learn Rock Smash. There are many Pokemon that can learn it. Most fighting type Pokemon can learn the TM. So no, you do not need Sudowoodo.
in silver you get of a bloke arfter beating or catching sudowoodo his the first man u see if u walk right from where u got sudowoodo in silver you get of a bloke arfter beating or catching sudowoodo his the first man u see if u walk right from where u got sudowoodo
you get the squirtbottle at the flower shop and water the tree(which is Sudowoodo)