PS vita uses Sony memory cards and it's not like PS3 where you can transfer MLB save files with USB. You can back up data but not the saves, I can't even see the saves in the xmb. If you have PS+ you can upload your saves to the PS+ servers, but you can't see vita saves on the PS3 and vise versa. I tried everything...I even contacted the San Diego studio via Facebook and they were no help. They stopped responding after a few PM exchanges, at least they did not ask me to reformat my PS3 like Sony support.
If anyone has a PS Vita and PS3 and has been using the cross play feature, shut off your internet and let me know how you was able to transfer your franchise, season or RTTS between the two systems.