The Legendary Pokémon Zekrom and Reshiram appeared first in the Unova region, and now you can add them to your Alolan adventure in October. During October 19-28, 2018, you can get Zekrom for your Pokémon Ultra Sun or Pokémon Sun game, or Reshiram for your Pokémon Ultra Moon or Pokémon Moon game.


United States: Target - October 19th to 28th, 2018
Canada: PTC Newsletter - October 2018
UK/Ireland: Nintendo Network - October 5th to 21st, 2018
Germany/Spain/France/Italy: Nintendo Network - October 5th to 21st, 2018
Australia: Nintendo Network - October 5th to 21st, 2018
Mexico: Best Buy - October 12th to 31st, 2018
Chile: weplay store
Guatemala: El Duende
Colombia: PePe ganga
Panama: Felix Estigames
Costa Rica: Vertigo
Peru: iToys Store
Honduras: Game Station

How to get Zekrom or Reshiram

1. Open your Pokémon Sun, Pokémon Moon, Pokémon Ultra Sun, or Pokémon Ultra Moon game.
2. Select Mystery Gift on the main menu.
3. Select Receive Gift.
4. Select Get with Code/Password, then Yes, then Yes again to connect to the internet.
5. Enter your code.
6. Watch as the Legendary Pokémon arrives in your game!
7. Speak to the delivery person in any Pokémon Center to receive your Legendary Pokémon.
8. Be sure to save your game.

Reshiram and Zekrom - Level / Moves:

YouTube Trailer - Reshiram and Zekrom Join the Fray in October!

Source: https://www.youtube.com/watch?v=ikLhwutD4CQ