I've been trying to get an endeavor pet but there is none in the create a pet page... How do I get one?

Well you can buy the elixir or go to Adoption Agency in Atebus which is on the explore map when you press Ziara

They are limited like the Aeanoid and Telenine. You adopt them through the moon Ziara.

Currently, there are no Endeavors for adoption on Ziara, but you can always search the Adoption Center in Delphi Beach for a premade one or buy a to change a preexisting pet into an Endeavor (also in colors like , etc). : )

Or, go to the Adopt R Us in Delphi and search for Endeavors, you might get lucky. If you pick that, keep checking, since they go quickly. Also, you can't pick the name or gender that way.