Rattlesnake

The Rattlesnake is an enemy present in EarthBound Beginnings. It has the same sprite design as the Snake and the Red Snake, except for its color which has been changed to yellow, and that a rattle now has been added to its tail. Unlike its other counterparts, it doesn't leave any item when defeated. It has the rare ability to use an unusually powerful attack, however, it exhausts itself doing so and faints after use. The entirety of its stats is a bit less than that of the Red Snake's, as only its offense and wisdom is superior to it in terms of value.

In-game description
"Where's that antidote."