My guild showed interest in how do I level battle pets using the Pandaria pet tamers, so I made it into a guide on our forums. Then other people wanted to see it too, and I thought that I should publish it here. It is not going to be as comprehensive as the 5.4 guide on Warcraftpets, but I have used its format as inspiration.
Since the tamers give sweet XP to your character as well as your pets, I wanted to have the most efficient way to level both, hence no spirit tamers, or legendary beasts in this guide. These are the XP gains for your character per tamer (battle + quest):
167 640 XP at lvl 85 228 800 XP at lvl 86 276 100 XP at lvl 87 339 900 XP at lvl 88 410 300 XP at lvl 89
I've divided the guide up to sections for easier readability and it assumes that you know how pet battles work.
Section I: Set Up Section II: Master Pet List Section III: Travel Route Section IV: Tamer Battles — Hyuna of the Shrines, Mo'ruk, and Farmer Nishi Section IV: Tamer Battles continued — Wastewalker Shu, Seeker Zusshi, and Aki the Chosen Section V: Further Reading