Board Thread:Questions and Answers/@comment-191.190.92.63-20141127235248/@comment-5007614-20141211190726

Strauss is right, Leader Skills affect the entire party, regardless of whether they specifically state it or not. I can't think of one Leader Skill that only specifies "self".

Look at Ice Fortress Oulu for example. It doesn't specify "all types" like it did in previous evolutions, but it works because you'll see your party members' HP are higher than normal while in battle.