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Bracken Hollow is the only area available in Spinach Caverns right now, so go ahead and enter. When you do, the Phantom named Cream will cause an avalanche of rocks to fall and block the entrance. She disappears while Parin ponders how she's supposed to get through. At that moment, Puku comes through and says he's pretty sure a mole would be able to make short work of the roadblock. Parin knows just who she wants to talk to about that.
You should, too. It's time to go to Mole Dojo, the second stop on the path leading back south from the cave. Make it your new destination.