Gain several levels in one battle easy
You'll need the following:
Chocobo Down (exp +20)
Chocobo Wing (exp +50)
Chocobo Feather (exp +100)
The following are not required but definitely help:
Black Chocobo Course
EXP Boost day or Bonus Day
This really helps with leveling up your characters, for example: It was my Bonus Day (EXP x2.0), I got a big Lucky Boost on my Black Chocobo course (EXP x3.0), and I was using the three chocobo components. This resulted in my character going from level 37 to level 44 (that's 7 levels) in one battle.
More tricks, tips and cheats for this game are right here - Dissidia: Final Fantasy cheats
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