You can't get the Secret Key in Pokemon Platinum without Action Replay, unfortunately.
You can get Action Replay from most major websites.
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No, you can't mix records in Pokémon Platinum in order to get the Secret Key from a friend.
You can only get the secret key in Pokemon Platinum
give him a secret key the different secret key the different rotom
fist you need to have a rotom then get the secret key
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.