I would like to get both of these pets, but when I go to create a pet, they are not listed... Where do I find them to create them? THX

Aeanoid requires an Aeanoid seed planted in the gardens. Water it every day as a normal seed, and when it's ready to pick it will attack your active pet, transforming them. So make sure you have the right pet active!

Edit for Gardens link: https://subeta.net/explore/gardens.php They're in Veta Lake. The barn at the top right of the map.

Not sure about Endeavors. They've always been limited, but I think something was changed. There's a place on Atebus were they used to be available, but it looks like they're only around during Masquerade now. There are elixirs for those anyway, so you can just change an existing pet.

THX that was really helpful!! :)