This event was given away to commemorate The Year of Legendary Pokémon via Serial Code (US 3DS) or via Nintendo Network (EU 3DS).
The gift received between Pokémon Sun & Moon and Pokémon Ultra Sun & Ultra Moon will slightly differ, in areas such as held item, level and moveset.
This Entei can only received on Pokémon Sun & Ultra Sun, while it is normally able to be encountered the Ultra Space Wilds of Pokémon Ultra Moon.
The Nintendo Network redemption (EU 3DS) runs from April 4th to 25th, 2018.
The Serial Code cards (US 3DS) can be obtained at Target stores between April 22 to 29, 2018.
The end date for the serial code redemption is not known at this point.
Format Ver.1.0.6-2, Post Updated Date:20180404_0742
Format Ver.1.0.6-2, Post Updated Date:20180404_0743