|Series||Explorer's Friend Series|
|Location||Frontier Cavern (Sublevel 5)|
This treasure is based on a toy punching glove. You can find this treasure on the 5th sublevel of Frontier Cavern, inside one of the four Mamutas that roam around this level of the cavern. You may want to take out the other mamutas and Caustic Dweevils first so that they don't hinder your treasure retrieving. After you get the Brute Knuckles successfully back to the Research Pod, it will be added to your Exploration Kit as the Rocket Fist. This upgrade allows you to use a more powerful punching technique as Olimar or Louie when pressing A without any Pikmin under your command. It is especially helpful in caves where you have lots of time to spare and you don't want to risk losing any Pikmin.
 Olimar's Journal
"Uncharted planets like this one are often teeming with hazardous fauna. The Pikmin are usually nearby to defend me, but there are times when I need to lay down the law with my own hands. For example, if a creature were to try to eat me, I'd have to beat it down... I dream about that all the time... "
 Sales Pitch
"In a plume of flame, this steel fist flies and smashes its target to bits...but the recoil is severe. (Captain Olimar suffers from shoulder pain, so he uses it without the rocket booster.) "