Brief Overview
Pet Party allows players to create and store configurations of Battle Pets for the pet battle system. In addition, players can select a Training Pet to assist in leveling new pets through tamer daily quests.
Basic Tutorial
1.) Open Blizzard's Pet Journal.
2.) Left click the Moonkin button in upper right of Blizzard's Pet Journal. This will open the Pet Party UI.
3.) Click the Create button to create a pet party. Name the pet party and click Create.
4.) Drag and drop battle pets from Blizzard's Pet Journal into the Battle Pet Slots' Configuration at the bottom of the Pet Party UI.
5.) Select the battle pets' abilities in the Battle Pet Slots' Configuration.
6.) Click Save to store the pet party.
Advanced Tutorial - (For Training Pets)
1.) Follow the Basic Tutorial to create an initial pet party for battling a daily quest tamer NPC.
2.) Drag and drop two battle pets from Blizzard's Pet Journal into the Battle Pet Slots' Configuration. These two pets should be designed to beat all three of the tamer's pets. (For example, using Farmer Nishi as an examle, use Dancing Water Skimmer and Darkmoon Zeppelin.)
3.) Drag and drop a battle pet to level from Blizzard's Pet Journal into the Training Pet frame at the top of the Pet Party UI.
4.) Drag and drop the Training Pet frame into the final slot of the Battle Pet Slots' Configuration.
5.) Click Save to store the pet party. Note: This will save a Training Pet as the final pet in this pet party and not the pet itself. So, changing the Training Pet will automatically update all pet parties with the Training Pet.
Source
The complete source with history can be found here.
Credits
Author - Authentication