The Baretta, also known as the R.ANKYLO in the NES version, is an enemy from the original Final Fantasy. They are very rare enemies that appear in the Great Desert and Cardia Islands. They appear in groups of two or four and are palette swaps of their stronger brothers, the Desert Barettas.
It is easiest to defeat them with regular physical attacks with the Warrior. They are resistant against magic, and they do not possess any elemental weaknesses, thus making physical attacks useful.
The Name Baretta is derived from the Bulette, a Monster from Dungeons & Dragons. In the original NES release of the original Final Fantasy, the Baretta was named R. Ankylo. This is short for red ankylosaurus, a large, armored dinosaur.