Tenda

The Tenda tribe resides hidden away in Deep Darkness, and is usually shy, until Ness gives the tribe's leader the Overcoming Shyness book. Once the Tenda tribe's leader reads it to the rest of the Tenda, he also gives you Tendakraut as thanks for solving their shyness problem. They also assist Ness in getting to the Lost Underworld.

Trivia
If Ness talks to the Tenda tribe's leader again after he reads the book to the entire tribe, he gives him a Bag of Dragonite.