Knuckle Slam

Knuckle Slam is Knuckles the Echidna's signature move in Sonic Rivals and Sonic Rivals 2. When using this move, Knuckles forms a field of shockwaves around him that damage all incomming, breakable obstacles.

Description
In order for Sonic to use the Sonic Boom, he must have his Star Item/Signature Meter completely filled, which can be done by collecting rings or defeating enemies. When executing the move, Knuckles jumps into the air, saying "Knuckle Slam", while charging up a type of red energy. Knuckles then punches into the ground with his fists, creating a large collum of red energy. After this, a wide field of red energy made of bursts of fire and minor shockwaves surrounds Knuckles, though the echidna can move around freely. This energy field will then remain active and surrounding Knuckles for as long as there are energy in the Star Item/Signature Meter, which begins to deplete once the Knuckle Slam is active.

While the Knuckle Slam is active, any breakable obstacle or badniks in the stage that come into contact with the energy field surrounding Knuckles are instantly destroyed. The 0pponents that Knuckles faces through the stages in the games, however, instead take damaged like as if they were hit by a normal attack.

As with every other signature move in Sonic Rivals and Sonic Rivals 2, Metal Sonic can perform this ability when using his own signature move, Copycat.