Can we please get Tinycorn again?! It would be really appreciated if we could.
Right now aside from the weekly pet rescues the best ways to get copies of pets are either to
A) spend gems with daily offers (winning up to 3 arena matches a day can unlock addtional offers at a reduced gem cost)
B) Trigger pet rescues for your guild by doing pvp until a pet gnome shows up randomly
C) Start a Gnome-A-Palooza using verses go into pvp quickly until you kill a pet gnome then go continue to kill gnomes in explore until it ends and then do the pet rescue you triggered.
Finding a good guild that aims for pet rescues helps as well, our guild manages to get 50+ pet rescues a week and even more when there are vault events