Combo attack

The Combo attack is a move that appeared in the anime series, ''Sonic X. ''It is the combined strength of Sonic and Knuckles in which they make into a powerful look-like Spin Attack.

Description
The Combo attack is a move where both Sonic and Knuckles combine their powers to perform a stronger semi-like Spin Attack. When using it, Sonic and Knuckles grab each other hand and begin spinning animation in air until they are enveloped in a circular wave of wind created by the spin's speed impact, or covered in a circular jet stream while each one synchronizes his Spin Attack with the other's one inside it. While in this state, they are turned into a powerful projectile of that could pierce through energy lasers and solid objects, and allow for a limited flight.

Anime
In the episode "Map of Mayhem", the Combo attack was suggested by Sonic to Knuckles in order combine their strengths to destroy Eggman's Egg Giant-Makan. In "Trick Sand", Knuckles helped Sonic escape the Metarex's trap by using the Combo attack to make a way through the Metarex's defense.

Trivia

 * The Combo attack is very similar to the Rolling Combo move from Sonic the Hedgehog 4: Episode II.