Wibble Wobble: How do I unlock Hidden Stage 6 in Downtown Springdale?

How do I unlock Grainpa in Wibble Wobble?
Get a Wib Wob to size 15 or bigger.

Hidden Stage 6

Finding Grainpa in Yo-Kai Watch Wibble Wobble is difficult because it is hard to tell what stage you have to defeat to unlock him. You can unlock Grainpa in Downtown Springdale by defeating Slicenrice on Stage 81, after getting a Wib Wob to size 15 or bigger. You can use Dracunyan or Signiton to help you complete the task and unlock Grainpa. Make sure you stock up on Shrimp Rice Balls so you can friend Grainpa after unlocking him.