Diglett first appeared in Pokemon Red and Green in 1996 as a small Ground type that lives underground, evolving into Dugtrio, a trio joined as one body. Their simple cries became familiar through the games and the animated series, and clips of the sound later circulated on meme pages and soundboards. The dugtrio meme format leans on the visual of three identical heads emerging together, which makes the audio a natural fit for jokes about trios, clones and unexpected group appearances online today.