Pet Brine Buddies

Pet Brine Buddies is an obtainable souvenir in WarioWare: Touched!. Players can use a magnifying glass to see various microbes, including bacteria, rotifers, and water fleas, at higher detail. Occasionally, a mermaid appears as one of the many small creatures that can appear in this souvenir. The light-bulb attracts the microbes to wherever it shines.

In-game description

 * "Zoom in on those salty little freaks with the magnifying glass! What does this stupid light bulb do?!"