I also changed Celebrate's effect to "unknown", which I meant to commit
separately but it got caught up in this one. It has a unique effect ID,
and we don't know for sure that it does nothing. Also, Splash's effect
(which it was sharing) says that the move is disabled by Gravity, which
isn't true of Celebrate.
Notes:
- I left all the flags surskitty added alone (powder, bite, pulse,
ballistics, and mental) because they don't seem to be in with the
other move flags. The only new flags are the Sky Battle one that I
added, and a mystery one, which I didn't add —
http://pastebin.com/K27Vk95J
- move_meta_* is a mess and I don't like it but X/Y seem to have all the
same move meta as B/W did so I updated it for the time being
- I didn't update effect_id because I'd have to sort out all the new
effects that I added manually and that sounds like a bigger endeavour
