Brute Knuckles

The Brute Knuckles is one of the treasures found in Pikmin 2. It is a toy that is found inside one of the four Mamutas in the fifth sublevel of the Frontier Cavern.

Collecting the treasure
Before collecting it, defeat all the Mamutas in the area so they won't harm the leaders or plant the Pikmin as the treasure is being carried back to the Pod. Make sure the Hydro Dweevils are gone so they won't carry the treasure on their backs. After the Research Pod cashes in the Brute Knuckles, the leaders receive the Rocket Fist ability.

Trivia

 * This is the only treasure which gives the player an utility-like Exploration Kit upgrade that has not been eaten by a boss.