The Secret Key was only available during the Rotom Pokemon event that took place last month. Now, the only way to get it is to hack for it.
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You can only get the secret key in Pokemon Platinum
You can't get the Secret Key in Pokemon Platinum without Action Replay, unfortunately. You can get Action Replay from most major websites.
No, you can't mix records in Pokémon Platinum in order to get the Secret Key from a friend.
give him a secret key the different secret key the different rotom
that's impossible unless u buy an action replay dude!!!!!!!!!!!!!!