Lostlorn Forest is a place in the Unova region near Nimbasa City. The forest seems like just a forest where you can catch pokemon. However it holds a bigger secret. There's a lady living in a trailer in the back of the forest that doesn't talk to you or anyone else. If you have the Shiny Entei, Raikou, or Suicune in your party from the distribution event, then the lady will jump out of the trailer and attack you. In the battle, she appears as an Entei until you hit her with an attack. The pokemon turns out to be Zoroark the illusion pokemon. The trailer and the woman living inside it had all been an illusion caused by Zoroark.