I never played Pokemon Ultra Sun & Moon, but from my understanding, it was basically a continuation of the original two games. A direct sequel similar to how Brotherhood was a direct sequel to Assassin’s Creed 2. Same world, same characters, but a different plot and environment.
One would assume Legendary Pokemon Xerneas & Yveltal from the previous two games would just be in Ultra Sun & Moon, but I guess that’s not the case. According to our snitch if you “head to a participating GameStop store from May 4–27, 2018, where you can get a code that will allow you to obtain Yveltal in Pokémon Ultra Sun or Pokémon Sun, or Xerneas in Pokémon Ultra Moon or Pokémon Moon.”
Sucks you have to step foot in a stinky Gamestop.