He is a robot that he was built by Taboo , and you must fight him two times .
The first time you use Marth , Ike and Meta Knight to fight him .
After the battle the floor breaks itself and Galleom falls below .
He meet the pokemon trainer and Lucas , and they start to fight .
After this second battle Galleom grabs the pokemon trainer and Lucas and he active his subspace bomb .
But thanks Lucas's "B up" and Meta Knight they save themself and Galleom explodes .
After he return in the "Big Labyrinth" .
He could return in SSB4 as a boss in the new story mode or even Classic/Arcade Mode.