From the Super Mario Wiki
A Blow Hard is a Pokey that fires Needlenoses at Yoshi in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS, and Yoshi's New Island. It always has a blinking crosshair to tell where it is firing. It is near invincible, but the player can pound the ground nearby or throw an egg at it to temporarily knock it out, but it will wake up a few seconds later. Blow Hards will always be facing Yoshi, so the player has to be careful. Any solid objects and platforms can stop their projectiles, however. It can be defeated in the former with a Special Blue Watermelon.
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