I'm going to answer this the best way I can since some girls can't learn abilities other girls learn. I'm not going to list special abilities only that one person can learn like Guardian Mog or High Jump.

HP 10%, HP 20%, Protect Girls.

This is all I can think of, since Freya shares abilities with Steiner and both Garnet and Eiko have different ones like Chemist for Garnet and MP10% for Eiko.

Q: When is the first time you are able to choose who you want to be in your party.