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 he was 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.
The time has come, it must be decided. Tabuu has created two massive generals, both robots, both tough. He knows that one will have the important job of protecting the halberd and one must be a general on the ground, to be deployed to make sure no rebellion is to get far. He knows that he must find out which of these two creations is the more powerful and he knows there is only one way to find out. Slowly the master hand begins to transmit a signal to gannondorf, the orange hooks holding it back pulsating. 3 days Later
The two levitan robots ready for the fight ahead, knowing full well what the differance between victory and defeat. The recently completed collesium is jam packed with Primid's, each one cheering for ethier Duon, Galleom or both. The gates slowly roll down and galleom is the first to exit, charging forward in tank form. Duon switches round to it's pink side and fires a cluster of missiles, which weave and swerve around, crashing harmlessly in front of galleom, who carries on charging. Duon wheels out of the way of the attack and sends a barrge of lasers, most missing their target due to the method of deployment, with only one striking galleom. Galleom swings round and attempts to slam into duon, but it gracefully wheels out of the way.
Noticing it's plan is not working Galleom begins the slow process of transforming back into robot form which allows duon to get a few cheap shots with it's missiles. However galleom is unfazed by this and sends a few missiles of his own back at the duel sided shadow bug boss, who is oddly enough barely effected by the missiles slamming into him. Galleom then charges and delives a massive uppercut, but duon wheels around it, switching around to it's blue side as it does. It swings it's head around and slams the axe head into galleom's side, who flinches in pain. Galleom grabs him by the head and spins him away, dazing duon and allowing for him strike him smash it with a massive punch. Duon shakes it's head furiusly before spurting forwards and delivering a series a quick jabs, which catch galleom of guard and force it too it's knees. Duon then leaps into the air and slams it's axe head into galleom's chest, crushing the outer armour with ease and leaving it convulsing in bursts of electricity. Tabuu (who has been watching from inside subspace) raises his hand, calling off duon's attack and making it return to it's waiting place. Tabuu smirks an evil grin, finally knowing which of his creations will defend the halberd.
Duon won because of two main reasons. The first was becuase of it's mobility, it was easily able to dodge and weave around galleom's attacks. The second was that unlike galleom who was a very close range orintated fighter, Duon was desgined to be able to fight at both long ranges and close quaters combat. To see the original battle, weapons and votes.