Big Shocker

The Big Shocker is the major alternative boss of Wet-Dry World. It is a large Amp that does damage upon contact with Mario. It is stationary.

Wet-Dry World
Works as listed above, appearing in the village. Is defeated by being hit by nearby flamethrowers.

Aqua Town
This alternative boss fight is considered non-canon. A way to defeat it has yet to be discovered.