The official Pokémon Rumble World website has revealed two passwords for Klefki and Doublade. Players can enter special passcodes into their Pokémon Rumble World game to unlock Pokémon. Players can only enter the password when they've reached Adventurer Rank 4. To enter a password, pause the game with the START Button, touch Passwords and enter the specific code in the Enter a Password screen. We have added a passwords page and will update it as new codes become available.

North American Klefki: 92955036, North American Doublade: 27418406, European Klefki: 37760163 and European Doublade: 17428954


Source: http://www.pokemonrumble.com/world/en-us/news/