Extended Hand of Friendship

The Extended Hand of Friendship is a treasure found in. As Olimar's description implies, it is a toy robot's arm.

Collecting the treasure
After the multi-tiered set of tunnels, you will find another tunnel, with one pine cone rolling back and forth. When the path is clear, move to the left, where a doorway can be found. Entering the door will play a cutscene with a Mockiwi. There are two Mockiwis in the room; the Mockiwi on the left holds the treasure.