The Boost is very similar to the similarly-named technique used by Sonic the Hedgehog, except it does not create a distortion when activated and does not reach the same level of speed. When performing Boost, the Gaia Colossus bows down and charges forward, increasing its forward-directed flying speed.
The Boost is only used during the boss battle with Dark Gaia where it is a quick method to reach Dark Gaia. However, due to the scale of the Gaia Colossus, the Boost is rather slow and when using it, the Gaia Colossus has a hard times moving to the sides. To use it in gameplay, the player has to press and hold down /.