Free Pokemon at Gamestop and Toys"R"Us

At Gamestop:

• Raikou -- January 3 - January 9
• Entei -- January 17 - January 23
• Suicine -- January 31 - February 6

At ToysRUs:

• Pikachu (Level 50) January 30 and February 5

Source

Free Regigigas

Do you have a DS and Pokemon Diamond or Pearl? If you do, head on down to your local Toys"R"Us to receive your free Regigigas.

Also if your planning on getting Platinum know that having a Regigigas in your party causes Regice, Regirock, and Registeel to appear periodically in Sinnoh.

Source