Canada is finally getting a download event. Toys R Us Canada has announced that they will distribute the Secret Key at the end of April. Below is the news quote from Toys R Us Canada's website.
"Exclusive Pokémon Platinum Version in store event! Get the Secret Key. Unlock the secrets in-stores between April 19th to 26th. Only the secret key lets you change Rotom's form in Pokémon Platinum. Be sure to bring in your Nintendo DS and Pokémon Platinum Version!
Nintendo DS hardware and Pokémon Platinum version required to participate."
Source:
Toys R Us Canada