Dispel

Dispel is a White Magic spell that appears in various games in the series. It removes positive status enhancements and some magic-based status ailments from its target. It is not always guaranteed that Dispel will work even if the creature does have a positive status effect on it. If there are no positive status effects on the creature that is the target of Dispel, there will be no effect.

Final Fantasy
Dispel is a Level 8 White Magic in the original Final Fantasy. As such, it is available only to White Wizards. It removes elemental defense rather than beneficial status in this version.

Final Fantasy II
Dispel is a White Magic that removes beneficial magic from the target. As it levels up, it is more likely to succeed.

Final Fantasy III
Dispel is a level 8 Black Magic spell in this game. It removes all beneficial status effects on the target.

Final Fantasy IV
Dispel is a White Magic spell learned by Rosa and Porom. It was removed from the SNES version however.

Final Fantasy V
Dispel is a Level 6 White Magic spell which can be purchased in Mirage Village.

Final Fantasy VI
Dispel is taught by Unicorn and Alexander.

Final Fantasy VII
The Destruct Materia has DeBarrier, which only removes protective barriers, and DeSpell which works similar to Dispel.

Final Fantasy VIII
Dispel can be Drawn from several enemies in the game.

Final Fantasy IX
Dispel is taught by the Tiger Racket, and only Eiko can use it.

Final Fantasy X
Dispel is a White Magic spell found in Yuna's section of the Sphere Grid.

Final Fantasy X-2
Dispel is learned by the White Mage dressphere.

Final Fantasy XI
Dispel is available exclusively to Red Mages. This makes them highly sought after by parties because almost all creatures can use special abilities that make them much tougher or harder to hit, or they have the ability to cast magic with the same effect. Dispel is Level 32 Black Magic aligned with the Dark Element.

Bards possess an equivalent to Dispel in the form of Magic Finale, a Level 33 Bard song. Since Bard finale functions off of light and Red mage functions off of dark, there is a possibility that one or the other would have a better success rate versus certain monsters with affinity or weakness towards one of those elements.

Final Fantasy XII
Dispel, as well as a multi-target upgrade Dispelga, is available on White Magick licenses 5 and 6 respectively.

Final Fantasy Tactics
Both the Oracle and Temple Knight can use the Dispel ability.

Final Fantasy Tactics Advance
Dispel is learned by the Bishop job. As such, only Bangaa can learn it.