Credits: Add Slayer95
Merge pull request #571 from Slayer95/master

Fix Quick and Wide Guard
Update UU banlist
Drought and Heracronite have been banned.
Thundurus-T and Deoxys-S are now BL.
Update UU bans
Fix Metronome on all past gens
Add HP Percentage Mod to Hackmons and BH

As Smogon OMs, both Hackmons and Balanced Hackmons 
require the use of HP Percentage Mod.
Gen 2: Mirror Move is valid on Metronome

Apparently Mirror Move can be called by Metronome on gen 2.
Source:
https://github.com/kanzure/pokecrystal/blob/master/battle/effects/metronome.asm#L46-61
Pokémon cannot mega evolve while recharging
Ghost-type Pokemon can be trapped in Gen 5
Trapped status is passable in Gen 4