Which Final Fantasy games will my gameshark work with?

Hello and yes I'm getting a gameshark v 2.1 and I am wondering which final fantasy games will work with it. Before you troll me and say stuff like I shouldn't use a game shark let me explain this to you. I've played all the games. I've gotten nearly everything in them. I'm just wanting more fun out of them like customizing other characters into my last party or fix some forgotten stuff. I don't plain to use it to be invincible and get every item. I DO HAVE GAMING SKILLS!!