if you know the sudowoodo blocking the way u have to battle it and catch it
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you don't
No you will need Emerald or Pokemon Colosseum to trade you a Sudowoodo.
You can find Sudowoodo on Routes 214 and 221.
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.
you can catch sudowoodo and smeargle