There's a few good combos. FWW+Poison Breath on a Najasaurus is the highest AoE damage output of any pet. A Triton with just FWW is also pretty good at AoE, and can self heal. Disco+Conductive Blast Triton pairs extremely well with a full Tamer/Mage for Death Ray nuking. Rune Corruption is incredibly powerful during a group fight.I am wondering, what would GENERALLY (specialized pets aside) be the 2nd best combo after AI+chiv on a pet? As chiv is not multi-monster friendly, I am thinking along the lines of AI+disco and AI+grasping claw etc. depending on the pet and its elemental damage (so basically, AI+"something debuffing elemental resists") and do the AoE myself (with necro or spellweaving or even melee skills) during occasional champ runs. This way, I have to just swap skills on soulstones instead of having every pet in two versions (single and AoE), which would save me many stable slots let alone a fortune in power scrolls.
Edit: Also after re-reading the last comment, if "less is more", I wonder if the best combo is no combo, just AI + nothing in order to force pets using AI if no other magical ability/special can really compete with AI and chiv.