Toys R Us is holding another of its periodicPokémon giveaways next week. If you're still playing Diamond and/or Pearl (or if you want to load up for Platinum), bring your DS and game to a local TRU between March 8 and March 21, and you can pick up the "Colossal Pokémon" Regigigas.
If you are planning on getting Platinum, a Regigigas might be a worthwhile provision. According to the news item, having a Regigigas in your party in Platinum causes Regice, Regirock, and Registeel to appear periodically in Sinnoh. Can you really sit by while Pokémon go uncaught? See you at TRU. %Gallery-25539% [Via Kotaku]