Souleater

Darkside, also known as Dark Wave and Darkness, is a self-damaging ability.

Final Fantasy IV
Dark Wave hits all enemies.

Final Fantasy VIII
Darkside can be learned from junctioning Diablos.

Final Fantasy IX
Steiner can use Darkside.

Final Fantasy X-2
Available to Dark Knights as Darkness.

Final Fantasy Tactics Advance

 * Warriors have Body Slam, which is non-elemental instead.
 * Fighters have Backdraft, which is fire-elemental instead.