FFX CTB battle system and learning abilities by observing enemies?

[PMG]

I'm sure there's probably already one out there but I can't seem to find it.

What I'm looking for is a battle system like Final Fantasy X preferably with the character switching and weapon and armour switching, but if not then it's OK.

Also I want to learn abilities by "Observing" enemies, something like "character 1 > Observe Enemy A > can only "defend" for 2 turns >  learn ability X (50% chance(optional))