Better error messages for promote/demote
New room rank: Player
Player is for players in battles; it gives them the ability to
appoint roomvoices and set modchat in rooms.
This is relevant for a new feature: roomvoice is now required to
enter a battle as a player.
pmmodchat applies to searching as well as pms/challenges
Better error messages for joining rated battle
Update 1v1 banlist
New event Pokemon

All Japanese events
Replace Acrobatics with Brave Bird on Talonflame

Brave Bird is better until the gems are released.
Ban Arceus-Fairy in 1v1
Update Oblivious descriptions
Event Pokemon can use Ability Capsule in Gen 6
Add 'megaEvolves' property to Mega Stones
Add `canMegaEvo` flag.
Set `canMegaEvo` flags false after Mega-Evolution