An update was added to the official 6.2 PTR Patch Notes that included additional information on the Bonus Event for Pet Battles. [source]
During Pet Battle Bonus Events, you’ll be able to take your pets out for a little exercise and earn triple pet experience from battles. Winning several PvP Pet Battles as a part of a quest during the event awards the player with an Ultimate Battle-Training Stone that instantly levels a pet to 25.
In addition to the triple pet experience buff, an account-wide, weekly pet PVP quest will be available during the Pet Battle Bonus Event.
The quest, The Very Best, can be obtained from an NPC located outside of your Town Hall during the event. Win five queued pet PVP matches against other level 25 teams and you'll be awarded with an Ultimate Battle-Training Stone.
If PVP isn't your cup of tea, you can still benefit from the Bonus Event. During the event all players receive a buff, Sign of the Critter. This bonus pet experience stacks with the Safari Hat, pet treats, and Darkmoon Top Hat.
The Pet Battle Bonus Event is scheduled to last for four days each month. That isn't a lot of time to take advantage of the experience buff, so better have all of your pet leveling accessories ready!
The weekly quest for the stone is account wide? I was looking foward to doing it on all my toons but was only available on the first toon =(
Im a little bummed that the quest is PVP related as i SUCK at pvp pet battles!
:(
If you have to battle 'with a team of level 25 pets', who levels?
I'm curious if this also boosts the XP gain from doing the Draenor/Pandaria daily battles. Instead of getting 6k-8k xp for one daily (with hat, lesser treat, and greater treat), would you then get 18k-24k xp for one daily battle?
Finally something better than those useless green battlestones.
This sounds awesome! Glad to see they're adding more stuff to pet battles so it doesn't feel as much like a "side thing" nobody really cares about. Maybe my guild will finally stop making fun of me for pet battling :D
So when is this taking place?