Final Fantasy Tactics

Abilities

Equip Gun (Mediator) + Battle Skills (Knight)
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The Breaking techniques are a lot more useful when used
at a distance.



Don't Move (Time Mage) + Meteor (Time Mage) or Summon
  Magic (Summoner) or Limit (SOLDIER)
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Spells that take a long time to cast are usually pretty
worthless.  But not if the enemies can't move out of
the way...



Regenerator (Priest) + Move-HP Up (Monk)
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You want HP?  You've got HP... but if it's still not
enough, throw in Chakra.



Counter Magic (Wizard) + Magic Attack UP (Wizard)
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If you're going to counter it, why not make it stronger?



Steal Weapon (Thief) + Throw (Ninja)
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This isn't that great a combo, but there's a certain joy
in stealing somebody's weapon and then turning around
and killing them with it.



Weapon Guard (Knight) + Silks
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Silks have a 50% evade rate, so equipping Weapon Guard
on a dancer means you can avoid half of all attacks.