Hyoro-Hyoro can be caught in the spring and are usually found in groups. They resemble tall, thin mushrooms that move around slowly. If a player approaches a Hyoro-Hyoro, it will retreat underground. Players must act quickly in order to capture one.
Hyoro-Hyoro can be found on The Plains besides The River.
It's Catalogue description reads:
"A mushroom that loves to groove to the music"