OHKO Moves

[Dragonstrike]

It's also worth mentioning that OHKO moves get 1 more point of accuracy for every level higher than the opponent you are.  Could also be a factor, albeit (probably) a minor one.  Of course, by the time those moves have enough natural accuracy to hit semi-reliably, you can probably OHKO your opponent with any neutral hit anyways. *shrug*

I have also noticed that the game's RNG can seem to be a bit weird at times, but I don't think there's much that can be done about that.