Terroot

About
Its sensitive roots can detect the slightest of vibrations from miles away. It can blend in with the landscape instantly to escape detection.

Obtaining
Play as an Etherian that can learn the move 'Bubble Beam'. Behind the giant tree stump is a small rocky hill. Follow the grassy path up the rocky hill to find Ellie. She will ask you to grow her tree, so to do so use Bubble Beam on the tiny sapling, making it rapidly grow into a big tree. Then, talk to her again and she will reward you with Terroot.