The Bubble Blower is a toy that you can buy, find on walks, and start with. It is simply a bubble wand. The player blows in the DS/3DS microphone and bubbles come out of it. However, it will decrease your Trainer points if a bubble pops.
DS: "Blow into the microphone to blow bubbles. Try different blowing methods to see what happens!"
3DS: "Blow into the microphone to blow a stream of bubbles."