here are all the codes (Credit, Bulbanews)
Mow Rotom: 7W6O3M5
Wash Rotom: H8S3A5W
Frost Rotom: 6TS8ORF
Fan Rotom: 9N4A4F8
Heat Rotom: T8A6EH7
and it doesn't unlock the secret key. it unlocks some stupid PC Gadget. The Secret Key is yet to be sent out in the US.