Proto Piranha

Piranha Plant in the Generators are Piranha Plants covered in Goop created by Shadow Mario. They have appeared in Super Mario Sunshine and the GameCube version of Mario Power Tennis. They appear out of Goop Generators (hence the name) and come in different colors. They periodically release Swoopin' Stus. To defeat them Mario had to shoot water in their mouth. During the first two encounters, Mario can defeat the Gate Keepers by squirting water in their mouth three times. However, during the last two encounters, Mario must squirt water into their mouth six times to defeat them.

In Mario Power Tennis, Petey Piranha's Defensive Power Shot involves him creating a Piranha Plant in the Generator to hit an out of reach tennis ball for him.

Trivia

 * Although the generators are made of goop, Mario cannot wash the generators away like normal goop without defeating the Piranha Plant.
 * Different colors of the Goop depend on how they attack: the pink-white Goop cannot spawn Swoopin' Stus and can only take three hits, the brown Goop can spawn Swoopin' Stus and can only take three hits, while the black Goop can spawn Swoopin' Stus and take six hits.