The custom pet here that takes event tokens the Astral Drake (lovely dragon), is the best, but any pet with the right skills are useful but honestly in pv the pets are useless. Keeping the pets healed while attacking the mobs is very time consuming, unless you are using the pet, on manual attack to help keep your chi up. Honestly the best way to do PV on a veno is with another class that has more aoe skills.
** edit adding this information.*** besides if you are trying to figure out which pet to get here they are all available at a NPC, no taming needed here, the skills are all available also the good ones.