Bounce Bros. is Luigi's first Bros. Attack in Mario & Luigi: Superstar Saga. It is learned alongside Splash Bros. in the Stardust Fields. The move costs four Bros. Points in Mode 1 and Mode 2, but costs three in Mode 3.
In Bounce Bros., Luigi jumps high off of Mario's back, going off-screen. Mario will jump and grab his legs. They will flip and slam into the enemy.
It takes eight uses of Bounce Bros. before learning the Advanced Command. In the Advanced Command, Mario and Luigi jump on two different targets.