Before they all died? Maybe in Hisui. They are still definitely around in Unova.

But you got me. The secret is out. [ is she still trying to figure out why he's a Zoroark and landing on spite or the lack thereof? ] I am Emmet. [ raises and waggles his claws in a terrible imitation of a bedsheet ghost. ] Fare dodgers will be perrrrsecuted to the utmost extent of the rules, yep. Those who disturb the sanctity of the subway will not be forgiven.