The official Pokémon Rumble World website has revealed two passwords for Pancham and Smeargle. A NicoNico stream also revealed a password for Eievui. 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 Pancham: 18294319, North American Smeargle: 18014401, European Pancham: 24197410 and European Smeargle: 35325215, Japanese Eievui: 24771725


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