to enter the elite four
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it is in the Pokemon league where you use waterfall
you get it at cave of origin but you have to beat the gym leader of sootopolis city to use it on the waterfall to ever grande city
you use waterfall at the Pokemon waterfall or the battlefield.
if you mean sudowoodo go battle frontier and use wailmer pail to the weird tree in south-eats near the waterfall
u use waterfall into meteor falls, and u search all over.GOOD LUCK