Press when Luigi builds up his thunder. Press when Luigi gets on top of Mario to perform a big jump! Press when Luigi is highest in his jump. Get an Excellent to deal heavy damage!
Super:
Press when Luigi builds up his thunder. When Mario's Hammer is above his head, press ! When Luigi gets to the base of the foe's feet, press the Button for an Excellent rating! If you succeed, there's a chance you'll lower the enemy's POW.
Thunder Bros. is one of Luigi's Bros. Attacks in Mario & Luigi: Superstar Saga and Mario & Luigi: Superstar Saga + Bowser's Minions. It based off of Luigi's Thunderhand move in the game. The move costs six BP on Modes 1 and 2, and four BP on Mode 3. In the remake, the move costs fourteen/ten BP on Normal, and seventeen/thirteen BP on Easy. Luigi will charge up a ball of electricity in his hands. When fully charged, pressing the results in Luigi jumping on Mario. Another press on at this time will send Luigi flying into the air, and one more hit will allow Luigi to cast a thunderbolt (or a small orb of electricity that explodes upon contact with the ground in the 3DS remake) below him, causing some damage to all enemies on the ground. The attack, if performed correctly, always lowers the enemies' defense. In the original game, the attack cannot hit airborne enemies unless the player failed the second Action Command; in the remake, it can now hit airborne enemies after Luigi casts the orb of electricity that explodes upon ground contact.
Once the attack has been successfully executed eighteen times, the Advanced Command is learned. In the Advanced version, Luigi damages only one enemy with more damage. To execute it, the player should press after the initial charge. Before Luigi lands on Mario, press to make Mario step backwards. Press again to make Mario pound Luigi into the ground, and again when Luigi's underneath his target. He will attack with a blue (purple in Bowser's Minions) electrifying uppercut that can even hit airborne enemies. The Advanced version, when performed correctly, will also lower the enemy's attack power. In the remake, Luigi will charge up the ball of electricity in front of Mario before he dunks him into the ground with his hammer.
Gallery
Mario & Luigi: Superstar Saga (blue electrifying uppercut)
Interestingly, the Bros. Attack in Mario & Luigi: Superstar Saga + Bowser's Minions costs less Bros. Points to use its Super version than its regular version.
when Luigi builds up his thunder.
!
results in Luigi jumping on Mario. Another press on 
to make Mario step backwards. Press 
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