It's about time we got a Koala Pokémon. Too bad it may be this gen's early route Pokémon, which are usually weak even upon their final evolution.
So the mysterious Pokémon from CoroCoro's trailer is a dog after all. And it's a Rock type? What?
You mean the story about the dog who died upon years waiting for its master to return?
Story of the dog who died years waiting for its master? If you remember the backstory with fossil Pokemon it's that they've been dead for years and were revived which gave them their Rock typing, so maybe this dog ended up being revived as a rock. Also, Iwanko seems to represent another alchemic element - in this case, lead.