From the Super Mario Wiki
Gale Boomerang is Link's side special move in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U, based on the Gale Boomerang item from The Legend of Zelda: Twilight Princess and replacing the Boomerang from the previous games. When used, Link throws a boomerang that generates a whirlwind; the attack hurts opponents when thrown, and the whirlwind draws opponents and small items in as it returns, though it deals no damage. Like the previous boomerang, it returns to Link automatically once it hits an opponent or a wall and the Gale Boomerang can also be thrown at an angle.
In Super Smash Bros. for Nintendo 3DS / Wii U, the move has two variants that can be swapped out. The first is Boomerang, which gives it similar properties to Link's previous Boomerang move, meaning that it does not pull in opponents. The second is Ripping Boomerang, which makes the attack slower and gives it a shorter range, but allows it to pass through opponents as it flies out and deals multiple hits rather than having the whirlwind property.