Sham
The Guardian of War
At least in the main series? Iris didn’t appear and it’s pretty clear Serena ain’t coming back at this point. I wonder what made them decide not to let previous Pokegirl come back. Of course SM is in it’s own odd category where Misty returned. I’ve seen some people contribute XY’s continuity being a reason why Iris didn’t appear and Misty being in SM was the reason why Serena didn’t come back. All speculation of course.