Star Rocket is Luigi's final available Bros. Attack in Mario and Luigi: Dream Team, also being the last available Bros. Attack in the game. Luigi can find the Attack Pieces for this move in Neo Bowser Castle, and it costs 12 BP to use. This attack is given Jump attributes and deals critical damage to enemies weak to jumps.
Upon use, Mario and Luigi run in the opposite direction from the enemies, eventually stopping for Luigi to throw a miniature Star Rocket in front of them, expanding into a larger star that both Bros. ride into the air. As the star flies towards the enemies, a trail of small stars appear en route, which the player must steer the star into to increase the attack's strength through tilting the handheld system. Eventually, the collecting sequence ends and the star will rise into the air. Mario will then crash down on the target and deal damage, surrounded by a varying number of small stars depending on how many the player collected. Subsequent to impact, the small stars will fly into the struck enemy for extra damage, Luigi repeating this process. The player must press the and buttons to increase the damage dealt by the initial jump.
If the first Bro defeats the targeted enemy, the second Bro will go back up and target another random enemy. If there are no more enemies when this happens, the attack will end. If all stars are gotten and the jump attacks are timed correctly, the player will receive an "Excellent!" rating. Lesser performances will yield "OK!", "Good!" and "Great!" ratings.