How would you make a region based on Australia?

Here are my ideas and don't hate me for them, just be kind.

>Region Name?
Urulu (from Uluru the origin name of Ayers Rock)

>Story?
An ancient civilization plans to awaken one of the giants (primeval legendaries) to destroy the modern world and bring people and Pokémon back to nature. The old civilization is directed by the old village leaders and they lie for their own benefits, as the elders are hiding the truth that the legendaries will exterminate all the people in the region. A young boy from this civilization helps you to learn more about their culture and to stop the ancient legendaries with the help of their god.

>Legendaries?
A Shark / Water/Steel and an Alligator / Water/Ground
Both are not in the story at the same time and only one of them is awakened in the story, they are gigantic and a threat for the region.

Third is a Thorn Devil / Dragon/Rock / Ayers Rock Pokémon
When it sleeps it looks like a huge mountain and nobody knows it is a Pokémon in truth. It is worshiped as god by the ancient civilization and when danger threatens the region it wakes up from its eternal sleep to protect the region.