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Plenty of Megafauna to serve as fossils.
Some birds of prey in Australia have been observed starting fires to help them hunt so there's a fire/flying type.
Gotta have flying fox and sugar gliders types.
Blue-ringed octopus for water poison.
We have a lot of snakes so maybe you can do something like that like one that can evolve into multiple different types like a "snake eevee" or something.
There's a tree called a wollemi pine that was thought to be extinct until 1994 so you could do a grass mon based on that.