@Taurus, it is true that Ledian would be frowned upon, however, it was a more comedic approach if you like. It's not like we don't have 2 megas that are Dark/Water already. You can say that they are different, and the same would apply to ledian an heracross. The set you mentioned is for normal Heracross, which takes Moxie into account and tries to work around that, whereas M-Hera is completely different, as it gets Skill Link and as such its movepool is now : Arm Thrust/Close Combat, Bullet Seed, Rock Throw and Pin Missile (or something else, because this one sucks). Anyway, what we know for sure is that in future releases, more pokemon will get fairy moves, as now we have way too few. I don't know if it's going to be a punch, even though I like the move just as you suggested it, but there will be more.
@Rumble, for the same reason we could make Machamp, Medicham and Tentacruel have the same ability. It's over the top, this one, as you can see that Kangaskhan got a Parental Bond (essentially a choice band) and hits twice and the second hit is half the power. How could we give the measly bug something that hits with 3.5X the original power? That's even higher than the Sniper+Critical Hit combo (only at 2.25). Not trying to limit your imagination or anything, but the way I see it, it's best not to come up with new abilities that are overpowered.