The SNES release Final Fantasy 3 has 2 player. Final Fantasies 4 and 5 (and of course 3/6) are two player on the Playstation releases.
[And before anyone mentions it, the Playstation versions of 4 and 5 are definitely the definitive way to go for official English releases. Any complaints about load times are absolutely exaggerated. The only Playstation Squaresoft rerelease with bad load times is Chrono Trigger.]