Zen Headbutt is missing from Genesect's movepool. It's a tutor move.
http://veekun.com/dex/pokemon/genesect#moves:tutor
http://www.serebii.net/pokedex-bw/649.shtml
Edit: Scratch that, all it's tutor moves are missing.
If a Pokemon uses a multi-hit move on a Pokemon with defensive boosts, each hit after the critical hit will ignore all defense boosts.
Log
Turn 26
Nightmare used Charge Beam!
The attack of Nightmare missed!
The foe's Cloyster used Icicle Spear!
Nightmare lost 5% of its health!
Nightmare lost 4% of its health!
A critical hit! Nightmare lost 33% of its health!
Nightmare lost 15% of its health!
Nightmare lost 9% of its health!
Hit 5 time(s)!
(note that Nightmare had x4 in both defensive stats)
I was using Bounce today and found out that whenever i used it, it drained 2 PP as opposed to just one. I think the game registers the first click as taking the initial PP and when you have to click it again because there is no other option, it takes away a second PP. I'm not sure if this applies to all 2 turn moves, but it did for this one
I used bug bite from a scyther on a zoroark and it didn't count as super effective damage.
The foe's Darkrai used Focus Blast!
It's not very effective... Ho-Oh lost 13% of its health!
Ho-Oh is fast asleep.
The sandstorm rages.
The foe's Darkrai is buffeted by the sandstorm!
Ho-Oh is buffeted by the sandstorm!
Ho-Oh restored HP using its Leftovers!
Ho-Oh is tormented!
The foe's Darkrai fainted!
Darkrai fainted to sandstorm but then lived to still torment my Ho-Oh with its bad dreams before fainting. I am pretty sure once a Pokemon's HP hits 0 it should exit the battlefield and therefore Ho-Oh should not be affected by bad dreams.
Ring Target is missing in the teambuilder, but it exists (and is in the B&W Research Thread). I had a look on all the pictures of items, it is really missing, not misnamed.