In Kingdom Hearts III, EXP Incentive is a support ability that increases EXP earned by 50%. If Sora's level is lower than that of the current area, an extra 10% increase is added per level difference (eg. if he is two levels lower, EXP yield is increased by 70%); this cannot increase EXP yield from a single enemy above 999.
Learning EXP Incentive
Kingdom Hearts III