This script allows you to set a limit to the number of skills a hero may learn and keep for use in battles a la Pokemon but the menu looks and works in a different fashion. Actually, it originally looked more like any default menu than anything else but I have slightly redesigned it in the latest version. Besides the player may select which learned skills will be replaced with new ones IF the player ever wants any of them to be replaced. There's no problem if the player may prefer to replace just a few or even none of them.
It's a Plug & Play script but it's still possible to change its settings by checking and editing most of the Constants found in the KSkill module.
It's also available for VX Ace!
OPTIONAL: Here's a way to manually increase a hero's extra skills limit at any given time. That limit will never be less than zero anyway.
Code:
$game_party.actors[INDEX].extra_skills += NUMBER GREATER THAN ZERO
$game_party.actors[INDEX].extra_skills -= NUMBER GREATER THAN ZERO
$game_actors[ID].extra_skills += NUMBER GREATER THAN ZERO
$game_actors[ID].extra_skills -= NUMBER GREATER THAN ZERO
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Or you can increase it by 1 if you equip a certain accessory.
They've told me that's how Persona works.