I loved the scorpion spell when i was a new wizard, I think we should have scorpion pets dropped from weaker bosses, such as, Lady Blackhope, Eyus Maximus, and the Kraken :D
None of my characters are Balance, but my daughter has one. I am hard pressed to think of a good dropped Balance pet, I have search on the wizard101.wikia.com site, looked at pets by school, and nothing really pops out at me. I would like to say the Golem Spider from Stoker at the end of Kensington Park, but it casts power play, and wouldn't that also boost the pips of the monster? And, if you are a GrandMaster, you already have something around 80% power pips, why do you need a boost. The Jade Oni is another, but details are sketchy.
I have searched the same site for a pet, Balance or otherwise, may-cast Balance talent, and I have not come across one. What a rip.
Now wouldn't a wicked Balance may-cast talent be Balance Blade? Oh man, every one would want that pet.