Learning Magic via Enemy Battle

Hello all, I was looking for a plugin that would allow my characters to learn moves/spell from an enemy during combat similar to how Blue Mages work in Final Fantasy XI (http://ffxiclopedia.wikia.com/wiki/Blue_Magic). A quick summary of what I am looking for would be able to have a chance to acquire the move/spell when defeating a monster/enemy that has used the move/spell.

Also I would like it to have like an equip spell feature to where even tho you have learned the spell/move you have to equip said spell before combat in order to be able to use it, the class would have a set point total/maximum that will increase per level and the spell would have a cost to equip. This would balance the system so that even tho you learn every and all spells from monsters and bosses, you can't use them all at once and you still have to level said class to be able to equip more moves to use.

I know its a lot to ask but this class has been my all time favorite class type and if I could somehow make a similar version in my RPG Maker games I would be very grateful. Thank you for taking the time reading my post.