You can't, you either have to trade a purified Sudowoodo from Pokemon Colosseum or trade the one you catch in the Battle Frontier from Emerald.
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No you will need Emerald or Pokemon Colosseum to trade you a Sudowoodo.
if you know the sudowoodo blocking the way u have to battle it and catch it
You can find Sudowoodo on Routes 214 and 221.
you can catch sudowoodo and smeargle
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