Yoshi rears back and dashes straight forward. If the dash connects with an opponent, Yoshi will headbutt them and a cutscene will initiate where the opponent appears in a lying position in a deserted, rocky gorge. The ground starts to shake as a army of giant multicolored Yoshis appear in the distance, running towards the prone opponents. The Yoshis emerge as they trample the opponent.
Unlike other Final Smashes that catch foes in a cutscene, Yoshi will stop and attack only the first opponent he comes into contact with. If other opponents happen to be hit by the headbutt, they will be trapped as well, but only up to a maximum of three total foes in the attack. The headbutt deals 5%, and the Stampede deals 43.4%, totaling the damage to 48.4%.
Stampede is also an attack used by Mini-Yoshi in Paper Mario: The Thousand-Year Door. It calls a massive herd of Yoshis that rush across the battlefield, dealing multiple hits of low damage each to all enemies. However, The Thousand-Year Door came out after Melee, and there is no prior source of a Yoshi stampede in the Mario universe, so it's possible that the move as it appears in that game is based on Melee's opening movie as well.