Official art for Galleom
Galleom is the gigantic robot of the Subspace Emissary. He will be fought a total of 3 times in Story Mode. An interesting point is that he has a Subspace Bomb planted inside him, for him to use in times when needed. He can also transform into a tank and drive at high speeds. When Lucas and Pokemon Trainer defeat Galleom, he activates the Subspace Bomb inside of him. Meta Knight then comes out of nowhere and rescues them.
Galleom is first encountered by Meta Knight, Marth, and Ike. The second encounter is with Lucas and the Pokémon Trainer. The third time you fight him will be in the final world, along with all of the other bosses and each character.