Dash Yoshi

Dash Yoshi is one of Yoshi's various power-ups in Super Mario Galaxy 2 along with Blimp Yoshi and Bulb Yoshi. Yoshi becomes Dash Yoshi whenever he eats a Dash Pepper. When that happens, he'll turn red, and move at a high speed.

In this state, Yoshi can run up steep slopes and even run on water, but the effects are only temporary, because when the music stops so does Dash Yoshi. Dash Yoshi can also use launch stars and enter pipes. However, when Dash Yoshi jumps he stops moving at high speeds but will immediately resume running when he touches ground. If Dash Yoshi eats another Dash Pepper while in this form his time will be extended. If Dash Yoshi hits an obstacle while running he will return to normal speed while he rebounds but will continue when he touches ground.

Trivia

 * Although Dash Yoshi looks most like an Orange Yoshi, the official website says that Dash Yoshi is a Red Yoshi: "Watch as he transform into the bright red Dash Yoshi..."