1. Go to Farmer Nishi and pick up the daily. Farmer Nishi - NPC - World of Warcraft
2. Quene for bg.
3. Start battle against Farmer Nishi, then do nothing and wait for bg invite, get invitet while in pet battle.
4. Win, lose or leave the BG (remember the 15 min debuff).
5. Talk to farmer Nishi and win (easy with a frog) -> get around 3000xp for a low lvl pet.
6. THEN (important) don't complete the quest, take your mount and fligh a bit away from Farmer Nishi.
7. Get back to farmer Nishi and you can pick up the daily again and start with point 1.
What is it good for?
A low lvl pet (lvl 23) gets around 3k xp for every battle, so you can level easy many pets to 25 (75 * lvl 25pet acm)