Smooth Rock in Pokémon Pokopia is a material necessary for creating Onix's habitat in Withered Wastelands or elsewhere, if you so choose. That said, there's only one known place you can find this item ...
The Smooth Rock is found in a yellow Poke Ball in the cave where Onix is trapped in the Withered Wasteland. Funnily enough, the rock that Onix needs for its ideal habitat is hiding in the exact cave ...
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