I need ideas for Main legendaries for my Australia region

I was thinking about who the main Legendaries for my fan game about a region based on Australia and I want the legendary Pokémon of this region to be based on the Dreaming. My only idea is the Rainbow serpent but if it needs to be a duo or trio, who else would be the legends. What would their theme powers be?

Ho-oh and Lugia represent Revival and Storms

Groudon, Kyogre and Rayquaza represents the Land, the Sea and the Sky.

Dialga, Palkia and Giratina represents Time, Space and Antimatter

Reshiram. Zerkom and Kyruem represents Truth, Ideals and the absence of either.

Xerneas, Yveltal and Zygarde represents Life, Death and the balance between the two.

Solgaleo, Lunala and Necrozma represents The Sun, The Moon and a Black Hole/Star

Zacian, Zamazenta, Eternatus, Urshifu and Calyrex represents The Sword, The Shield, The Cannon, The Armour and the Crown

Koraidon and Miraidon represents the Past and The Future

Ogrepon represents traditional Japanese Masks and Terapagos represents the World.

So who should the Aussie legendaries be? What theme could I do?

If anyone has any ideas, let me know in the comments below.