Wikia

A Special Attack Bakugan is a Bakugan with a special feature that may range from spinning to double sided to heavy metal.

The Gundalian Invaders Special Attacks are called Super Assault Bakugan.

Variations

Heavy Metal: Have a chrome metal band around the middle of a Bakugan, designed for extra stability.
Spin/Cyclone/Typhoon/Vortex/Orbit: Have a winding mechanism, top half of the Bakugan spins when opened, designed for knocking other Bakugan off the card. This type of Bakugan usually opens up without being set on a metal Gate Card.
Element/G-Power Change: Have a wheel, which rotates when opened. Have three printed attribute symbols and G-powers on wheel. The Attribute/G-Power is then changed to that shown on wheel.
Jumping/Boost: Have a small protruding spot on the bottom of the Bakugan, designed to hop when rolled.
Turbine/Fly Wheel: Have a small gyroscope in the middle of the ball, a ripcord is used to spin the gyro, which the Bakugan will roll automatically when placed on a flat surface.
Preyas II: Preyas Angelo and Diablo are on opposite poles, has twice the chance of standing.
Light Up: The Bakugan lights up. It can also make sound, but some can't.
Dice Thrower: When the Bakugan opens it throws a die that determines its attribute or G-Power.

Meta Dragonoid, Iron Dragonoid, Mutant Elfin, Flash Ingram, and Cyclone Percival were going to be released as Special Attacks in Bakugan: New Vestroia, but remained unreleased for some reason. Instead, they will be released in Bakugan: Mechtanium Surge. Flare Wilda was also never released and does not have a release date yet.