It is an event in the new Pokémon Black & White games that gives you the chance to catch Zoroark. To activate this event, however, one of the three Shiny Legendary Beasts Entei, Raikou or Suicune are necessary. You can obtain them by pre-ordering tickets for the 13th movie Phantom Champion: Zoroark.
To unlock the event you have to have a shiny Entei , Raikou or Suicune transferred to your Black White versions. The download will be available in Japan from 18th June till August 31st. When and How to get the beasts anywhere else is not yet known.
|Raikou Level: 30||Entei Level: 30||Suicune Level: 30|
Now a Zoroark Level 25 appears and challenges you. During this battle, Zoroarks ability "Illusion" is activated. It is always in the form of one of the beasts (most likely Entei). It will also change back so you have the chance to catch it.
It is now proven that we are able to communicate with the 4th generation games. Here´s a little preview on the event taking place.