From the Super Mario Wiki
Magikoopa Mob is a Special Attack that Bowser uses in the Nintendo DS game Mario & Luigi: Bowser's Inside Story. It requires Bowser 15 SP to use. It involves having Magikoopas line up in many designs: curves, L's, horizontal lines, vertical lines, etc. The player has to use the to trace their position so Bowser can throw fireballs on the Magikoopas, which they then re-use to attack every opponent with their wands. When the wand has a yellow spark over it, Bowser throws a fireball on it. If all the Magikoopa's wands are touched, they create more damage than 4 or 3 of them alone. After about 4 or 5 times, the Magikoopas walk off the stage, exhausted. To use this move, Bowser must free the Magikoopas from Peach's Castle with the Red Key. The Magikoopas were the only minions not shown by the Fawfulcopter begging for help.
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