Other Photon Arts (extra Mode)

[Valueowned]

So I started playing extra mode and I cant figure out how to get the other photon arts besides the ones in the shop I searched all over the net and still cant find anything out, some help would be great thanks.

[Tycho]

If you get S-rank in any Mission, there's a chance one of the NPC allies on your team will give you one of theirs (two per NPC I believe).