It seems that Rock Pikmin are only good for combat
along with the ability to break barriers, can probably lift as much as purple, has a heightened fire resistance and may be used for pressure pads
not sure about combat, because the best way to attack is to throw it directly onto an enemy, however it is probably hard to lift because of its assumed weight. probably can't swim either.
maybe they're perfect walls of defense and can damage the enemy if eaten
