These ones spawn in Dalaran. You have to actually click on Dalaran to see them. Even with my World Quest Tracker addon the Dalran ones won’t show up until I click on Dalaran proper itself.
Sir Galveston was last up on the 13 February, Amalia on 7 February, Bodhi on 5 February, and Tiffany Nelson on 3 February.
These ones require you to complete parts of the Suramar quest chain to see when their WQ is up, but as long as their WQ is active you can battle them even if you haven’t done any of the chain.
Aulier was last up on 18 February, and Varenne on 12 February.
I post daily pet battle reports here on the forums, on my Twitter, and in the Xu-Fu’s, Secret Finders (battle pet section), and WarcraftPets Discords: