The Legendary Pokémon Raikou and Entei will be available at participating North American Target stores soon. You can receive Entei in Pokémon Ultra Sun or Pokemon Sun games, or Raikou in Pokémon Ultra Moon or Pokemon Moon. Much like the past distributions, they will be level 60 in Sun and Moon and 100 in Ultra Sun and Ultra Moon. This event runs from April 22nd to the 29th.
For Europe and Australia, the distribution is already ongoing over Nintendo Network. It lasts in those regions until the 25th.
Be sure to mark these dates on your calendar!