I have a couple of cool ideas for an Australia region
A Ground/Flying or pure Ground type bird based on the Cassowary (A Flightless bird)
A Poison type regional form for Krookodile (Saltwater Crocodile)
A regional form for Komala (Looks the same, but doesn't have the log) and a regional evolution (Normal/Grass) for it (Komala evolves by holding a Branch from the Eucalyptus tree, which can only be found in this region). This is the original Komala and the reason why Komala in other regions hold the log, is because they are unable to evolve.
A Dark/Electric or Dark/Fire type Tasmanian Devil
Fighting type Kangaroo line
A Ground/Grass type based on the Numbat
Normal type Bandicoot (Regional Rodent)
Water type Short-Beaked Dolphin
Water/Fire type regional form for Dewgong
Water/Steel or Water/Ice type Seal or Sea Lion
Fire type Dingo
Water/Poison type Platypus
Regional form for Crobat (Dark/Flying or Rock/Flying)
a Fossil based on the Thylacine (Tasmian Tiger)
I’d also have a water/grass Bunyip and a fire/dark legendary based on Bila, a cannibal sun goddess from aboriginal mythology.