Brute Knuckles

The Brute Knuckles is a treasure in Pikmin 2 that is actually a toy punching glove. It is held by one of the four Mamutas on the 5th sublevel of the Frontier Cavern. After the Research Pod cashes in the Brute Knuckles, the captains will gain the Rocket Fist ability.

Captain 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.)"