Galleom appears to be a giant, purple robot/cyborg which has simian features, and is also capable of transforming into a jet propelled tank labelled as the Galleom Tank. He is covered head to toe in a heavy mechanized arsenal, possessing two rocket launchers as shoulder weapons, and powerful jets on his feet. He wears an iron mask that covers his face, as well as metallic arm braces over his bulky forearms. He is also quite agile in his simian form, capable of performing extremely large jumps, as they are jet propelled. In his tank form, he is much more compact, only being able to attack by either firing the missiles on his back, or simply by ramming into his foe at a high speed. As a last resort, he can set off a Subspace Bomb hidden within his head.
Marth, Ike, and Meta Knight were the first to spot Galleom as they were traveling through the desert in his tank form. The trio quickly caught up to him and defeated him, knocking him down onto unstable ground which gave way, and Galleom landed in the Ruined Hall, where Lucas and Pokémon Trainer challenge him. They manage to defeat him and, in a last desperate attempt, Galleom grabs both Lucas and Pokémon Trainer, starts the the countdown on his emergency Subspace Bomb, then jets into the sky. Lucas manages to free both himself and the Pokémon Trainer by using PK Thunder, but in the process causes them both to fall a great distance. Meta Knight manages to catch the duo just before they fall to the ground, then flies away with them from the Subspace Bomb's blast. Galleom is then sucked into The Great Maze, along with the trophy of Wario, and repaired, where he must be fought again.
Galleom has two Trophies, one featuring himself (which is obtained by using a Trophy Stand on Galleom), and the Galleom Tank trophy, which is obtained by completing Boss Battles mode on Intense difficulty. As a side note, completing Boss Battles on Intense difficulty is the only way to get this Trophy, as using a Golden Hammer on the challenge square holding the Trophy will not work (except in the PAL version, where every box can be broken).
An enormous, transforming robot and Subspace Army warmonger. Galleom is characterized by various attack threats, including jump stomps, beefy arm bludgeonings, and even missiles fired from his back. He also has a Subspace Bomb set in his head, which he can use in times of desperation to blow himself up and drag the player into the darkness of Subspace. He's one tough robot!
Super Smash Bros. Brawl, 2008
Galleom with his arms and legs neatly compacted into tank form. In this form, he can get around the combat field at high speed. He can quickly change into humanoid form to take advantage of awesome combat capabilities. His last defense and most threatening trait is a built- in Subspace Bomb. In tank form, Galleom can still attack with body slams and missiles. He never runs.
Galleom's name is likely a reference to the mythical creature Golem, and/or to the metal "Gallium".
Galleom has two different death animations. The first is that he keels over, weakened but still operational. The second is he falls on his back and dies with multiple explosions. The latter usually appears in the last couple of rounds in Boss Battle Mode and sometimes appears after defeating Galleom with a powerful attack at low health, such as with Falcon Punch.
In Boss Battles, the arena that Galleom appears in (in the desert or in the large ruin chamber) is random.
The music in the battle is the same as the Duon battle as they are both the only bosses who hail from Brawl, aside from Tabuu.
On Galleom's trophy, he appears to be grabbing the stand with his right hand.
Due to Galleom's jump attacks and tank rushes, some people believe that it is based on the Kirby boss, Heavy Lobster.
The player cannot get a Galleom Tank Form trophy simply by throwing a trophy stand at him while he's in tank form. It only turns him into the regular Galleom trophy. The Tank Form trophy can only be acquired by completing Boss Battles on Intense mode.
Galleom is the only boss in the SSE that is battled twice before the Great Maze.
This could imply that Galleom is stronger than Duon in terms of hardiness. This can be justified by the fact that while Duon is an entity formed by Shadow Bugs, Galleom is apparently all machine, due to the lack of Shadow Bugs swarming out of him when defeated.
Galleom's Subspace Bomb is set for fifteen seconds, whereas all of the other ones are at three minutes.
The bomb might also have a time span of which could be longer than three minutes, as the location that Galleom was heading to is undetermined, so it could be possible that Galleom was assigned to bomb a location farther than "The Wilds" area to draw in, where it was instead deterred by Marth, Ike, and Meta Knight.
It is also possible that Galleom has control over the amount of time it takes for its Subspace Bomb; this seems possible due to the fact that his final action was a kamikaze run with the intent of destroying Lucas and the Pokemon Trainer.
If Boss Battles is hacked to play as Giga Bowser, Galleom seems to be the bigger of the two.