Stomp

The Stomp is a move used by Sonic the Hedgehog which first appeared in Sonic Unleashed. It involves Sonic performing a powerful stomp into the ground to destroy enemies and obstacles.

Usage
To use the stomp, Sonic has to be airbourne, whether it is from a jump or from something on the stage's course. He then proceeds to slam directly downwards with one of his feet first, which creates a blue field around him. Once landing on the ground, Sonic releases a destructive shockwave which damages the nearby surroundings. This is useful for Sonic to destroy enemies and obstacles, break through weak surfaces and activate pressure pads. This move can also help Sonic reach the ground quickly.

Sonic Unleashed
The Stomp first appeared in Sonic Unleashed. In order for Sonic to perform the Stomp on the PS3/Xbox360 version of the game, he has to possess the upgrade called the Stomping Shoes. Once obtained in these versions, Sonic can perform the Stomp by pressing the circle/B button while airbourne.

Sonic Colors
The Stomp returned in Sonic Colors as one of Sonic's standard moves. He can perform the Stomp while airbourne by pressing the Z button.

Sonic Generations
The Stomp reappeared again in Sonic Generations as one of Modern Sonic's standard moves with the controls identical to Sonic Unleashed's, while on the 3DS version, Sonic has to have obtained the Stomping Shoes before he can use it. If Sonic is equipped with the Skill named Power Stomp, it increases range of the shockwave generated by the Stomp, thus allowing Sonic to damage more enemies in the vicinity.

Trivia

 * If one looks closely, the Stomp attack highly resembles Sonic's Down Aerial attack (also known as a Meteor Smash) in Super Smash Bros. Brawl.