The official Pokémon website has announced that a Krookodile based on the one used by Ryota Otsubo in the 2017's Pokémon World Championships Video Game Masters Division, will be distributed at the Pokémon North America International Championships at the Greater Columbus Convention Center in Columbus, Ohio, between Friday, July 6th, 2018 and Sunday, July 8th, 2018.

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Get a Champion's Krookodile!

Stop by the North America International Championships to add last year’s champion's Pokémon to your game.

The Pokémon North America International Championships features some of the finest players in the world battling it out in fierce Pokémon Trading Card Game and video game competitions. To commemorate the hard work that goes into being the best, Pokémon fans will be able to get a Krookodile that matches the one that Ryota Otsubo used to become 2017's Pokémon World Championships Video Game Masters Division Champion. During his victory, Ryota's Krookodile held a Groundium Z Z-Crystal, which this Pokémon will not be holding. You can, however, let your Krookodile hold the Groundium Z that you earn from Hapu when you defeat her in the Poni Island grand trial.

Come to the Pokémon North America International Championships at the Greater Columbus Convention Center in Columbus, Ohio, between Friday, July 6 and Sunday, July 8, 2018, and look for signs there to find out how to get your Krookodile via local wireless. You'll need your own system in the Nintendo 3DS family and a copy of Pokémon Ultra Sun, Pokémon Ultra Moon, Pokémon Sun, or Pokémon Moon to get Ryota's Krookodile. You can receive Ryota's Krookodile even if you don't have an event badge.

Source: https://www.pokemon.com/us/pokemon-news/get-a-champions-krookodile/