The launch of the new Pokémon Bank service has been hindered by players uploading hacked creatures.
The service hit Japan this week, and already has its fair share of impossible monsters, as highlighted by players on GameFAQs. Amongst the misfits were hacked/cheated monsters, which can exist but have been artificially enhanced, and illegal ones - which can't exist within the games.
Nintendo had admitted previously that there would be some checks in place, but for now it seems that players are still able to upload hacked/illegal creatures to the service with ease.