The Pokemon Company is giving away a special in-game item for Pokemon Brilliant Diamond and Shining Pearl.
Until Mar. 27, all players can download Oak's Letter, which is required to encounter the mythical Pokemon Shaymin in the games.
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Oak's Letter is being distributed via Mystery Gift, a communications feature that's unlocked roughly two hours into the adventure.
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1. Select Mystery Gift2. Select Get via Internet3. Connect to the internet and download the item
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After unlocking it, press the X button to open the menu and follow the steps which is on next slide to claim the item
How to catch Shaymin-all players can receive Oak's Letter, you must first enter the Hall of Fame & obtain the National Pokedex before you can encounter Shaymin.
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After completing those requirements and downloading the letter, you'll need to meet Professor Oak on Route 224.