The Pokemon Company has finally answered the question of who let the dogs out. It turns out it was them. Mystery solved.
Legendary Pokemon from the second generation, Gold/Silver/Crystal, are being distributed out of Target starting April 22 through the very time-limited date of April 29. That gives you just one week to grab Entei, the fire legendary, and Raikou, the electric legendary, for your copies of Pokemon Sun/Ultra Sun or Pokemon Moon/Ultra Moon respectively. Your version determines what legendary you get, so bring both if you want both!
I am curious if Pokemon distribution events will be handled in a similar way when the game eventually comes to Switch.