You can get Paul Ruiz's 2018 Pokémon World Championships Video Game Masters Division Champion's Gastrodon for your copy of Pokémon Ultra Sun, Pokémon Ultra Moon, Pokémon Sun, or Pokémon Moon by stopping by the Greater Columbus Convention Center in Columbus, Ohio, during the 2019 Pokémon North America International Championships.
Look for signs at the Pokémon North America International Championships with directions on how to get Paul's Gastrodon via local wireless. You'll need your own system in the Nintendo 3DS family and a Pokémon Ultra Sun, Pokémon Ultra Moon, Pokémon Sun, or Pokémon Moon game to get this World Champion's Gastrodon. You can receive Paul's Gastrodon even if you don't have an event badge.
Ability: Storm Drain