I am looking for a program like FFTastic or a pre made checksum for ff9 save files
Hmmm you should really be more specific, I don't know what FFTastic is. However if you are looking for FF9 CRC algorythm that is a bit more complex.
Checksum <- not likely to be this and improper term.
FF7 + use a CRC cyclic redundancy check. This checks for errors a lot better than a checksum will ever come close too. MD5 is better or reed solomon encoding (you can have 192 bits/24 bytes of errors and still get the original data out.)
Back to the question, the problem with performing said check is one must find what data the check is done on. For FF9 I haven't gotten very far, got destracted by GBA game programing instead

Cyb