Giga Bowser Transformation is Bowser's Final Smash in Super Smash Bros. Brawl. It causes him to turn into Giga Bowser from Super Smash Bros. Melee, gaining immense strength. It seems that this time, Giga Bowser is completely invincible, as in the screenshot to the right, Zelda, Pit, and Samus are shown attacking him, but to no avail. A caption in the update also says "He must be invincible!," further implying such an ability. The transformation lasts about 10-15 seconds.
In a video, Giga Bowser is seen using his dash attack, which did 16% damage with no special effect, his forward A attack which had a dark energy effect, and his forward smash which did 35% and fire damage. His standard A combo does 16% damage. His up-smash does 44% damage and electric damage. His down smash has ice like properties, and presumably freezes.
It has also been said by people playing the demo that he does indeed take damage, but without knockback.
External Links
Short video demo at 3:52 [1]