Big Guy the Stilted

Big Guy the Stilted is a robotic Stilt Guy in Yoshi's Island DS. He is found in his castle, along with many Shy Guys. To defeat him, Yoshi must use eggs (or Baby Bowser's fire breath) to knock Big Guy the Stilted off the edge, giving the Yoshi a chance to Ground Pound him. Many Shy Guys are inside this robot, making for an easy egg supply. After three Ground Pounds, it cracks and falls into the lava, and the Shy Guy operators went with it.

Trivia

 * Big Guy the Stilted may have been planned to be a real Big Guy instead of being a robot, as a beta image of it shows it almost devoid of the patches and robotic features that covered it in the final game. However, one patch is discretely visible even in this screenshot, indicating that the reason for his lack of robotic features in the screenshot may have simply been because his sprite was incomplete at the time the screenshot was taken.
 * The Shy Guys going down with it is punned on real life, when a ship sinks, the captain and advisors used to be supposed to go down with their ship. That is rare today.