Level 4 Limit Breaks

Who	Where	Called
	Buy at Battle Area 32000 BP	OmniSlash
	Find at North Corel	Catastrophe
	Find at Nibelheim by playing the piano.	Final Heaven
	Find at the Blacksmiths house.	Great Gospel
	Find in Mansions safe after you defet the boss	Cosmo Memory
	In her home town after she beats her dad in the tower.	All Creation
	Find in the waterfall cave	Chaos
	Find in sunken sea plane	Highwind

Tifa's limit 4 is in the piano at her house. You need to have Tifa in your group and then play this combo {X,S,T,R1+T,R1+S,X,S,T,R1+X,C,X,S,T}