The official Pokémon Rumble World website has revealed 5 passwords for Hawlucha, Noibat, Pumpkaboo, Slowbro and Zoroark. Players can enter these special passcodes into their Pokémon Rumble World game to unlock the Pokémon. Players can only enter the password once 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 officially available.

North America Passcodes

European Passcodes

Sources: http://www.pokemonrumble.com/world/en-us/news/ and http://www.pokemonrumble.com/world/en-gb/news/