Pet battle exploits I have found.

[Atselmya]

1. Logging into other characters lets you revive pets with no cool down.

2. Using moonlight weather and a pet with revival ability's will sometimes rez other pets in your party with the same ability

3. If you log out with the proper timing you can use the "find pet battle" ability to get free ports around the world

[Watcher]

Nice one +3 Rep

[CelticMoon]

Cool list of exploits

+rep

[akspa420]

Also, if you pickup spell #125610, you can spam a bright light that visually annoys other players